// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Runtime.Serialization;
using WinForms.Common.Tests;
using Xunit;
using static Interop;
using static Interop.ComCtl32;
using static Interop.User32;

namespace System.Windows.Forms.Tests
{
    public class TreeNodeTests : IClassFixture<ThreadExceptionFixture>
    {
        [WinFormsFact]
        public void TreeNode_Ctor_Default()
        {
            var node = new TreeNode();
            Assert.Equal(Color.Empty, node.BackColor);
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(node.Checked);
            Assert.Null(node.ContextMenuStrip);
            Assert.Null(node.FirstNode);
            Assert.Equal(Color.Empty, node.ForeColor);
            Assert.Throws<InvalidOperationException>(() => node.FullPath);
            Assert.Equal(-1, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.Equal(0, node.Index);
            Assert.False(node.IsEditing);
            Assert.False(node.IsExpanded);
            Assert.False(node.IsSelected);
            Assert.False(node.IsVisible);
            Assert.Null(node.LastNode);
            Assert.Equal(0, node.Level);
            Assert.Empty(node.Name);
            Assert.Null(node.NextNode);
            Assert.Null(node.NextVisibleNode);
            Assert.Null(node.NodeFont);
            Assert.Empty(node.Nodes);
            Assert.Same(node.Nodes, node.Nodes);
            Assert.Null(node.Parent);
            Assert.Null(node.PrevNode);
            Assert.Null(node.PrevVisibleNode);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.Null(node.Tag);
            Assert.Empty(node.Text);
            Assert.Empty(node.ToolTipText);
            Assert.Null(node.TreeView);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_Ctor_String(string text, string expectedText)
        {
            var node = new TreeNode(text);
            Assert.Equal(Color.Empty, node.BackColor);
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(node.Checked);
            Assert.Null(node.ContextMenuStrip);
            Assert.Null(node.FirstNode);
            Assert.Equal(Color.Empty, node.ForeColor);
            Assert.Throws<InvalidOperationException>(() => node.FullPath);
            Assert.Equal(-1, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.Equal(0, node.Index);
            Assert.False(node.IsEditing);
            Assert.False(node.IsExpanded);
            Assert.False(node.IsSelected);
            Assert.False(node.IsVisible);
            Assert.Null(node.LastNode);
            Assert.Equal(0, node.Level);
            Assert.Empty(node.Name);
            Assert.Null(node.NextNode);
            Assert.Null(node.NextVisibleNode);
            Assert.Null(node.NodeFont);
            Assert.Empty(node.Nodes);
            Assert.Same(node.Nodes, node.Nodes);
            Assert.Null(node.Parent);
            Assert.Null(node.PrevNode);
            Assert.Null(node.PrevVisibleNode);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.Null(node.Tag);
            Assert.Equal(expectedText, node.Text);
            Assert.Empty(node.ToolTipText);
            Assert.Null(node.TreeView);
        }

        [WinFormsFact]
        public void TreeNode_Ctor_String_TreeNodeArray()
        {
            // Work around: We cannot serialize type System.Windows.Forms.TreeNode[] because it lives in the GAC.
            TreeNode_Ctor_String_TreeNodeArray_Helper(null, Array.Empty<TreeNode>(), string.Empty);
            TreeNode_Ctor_String_TreeNodeArray_Helper(string.Empty, Array.Empty<TreeNode>(), string.Empty);
            TreeNode_Ctor_String_TreeNodeArray_Helper("text", new TreeNode[] { new TreeNode() }, "text");
            TreeNode_Ctor_String_TreeNodeArray_Helper("text", new TreeNode[] { new TreeNode(), new TreeNode("text") }, "text");
        }

        private void TreeNode_Ctor_String_TreeNodeArray_Helper(string text, TreeNode[] children, string expectedText)
        {
            var node = new TreeNode(text, children);
            Assert.Equal(Color.Empty, node.BackColor);
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(node.Checked);
            Assert.Null(node.ContextMenuStrip);
            Assert.Same(children.FirstOrDefault(), node.FirstNode);
            Assert.Equal(Color.Empty, node.ForeColor);
            Assert.Throws<InvalidOperationException>(() => node.FullPath);
            Assert.Equal(-1, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.Equal(0, node.Index);
            Assert.False(node.IsEditing);
            Assert.False(node.IsExpanded);
            Assert.False(node.IsSelected);
            Assert.False(node.IsVisible);
            Assert.Same(children.LastOrDefault(), node.LastNode);
            Assert.Equal(0, node.Level);
            Assert.Empty(node.Name);
            Assert.Null(node.NextNode);
            Assert.Null(node.NextVisibleNode);
            Assert.Null(node.NodeFont);
            Assert.Equal(children, node.Nodes.Cast<TreeNode>());
            Assert.Same(node.Nodes, node.Nodes);
            Assert.Null(node.Parent);
            Assert.Null(node.PrevNode);
            Assert.Null(node.PrevVisibleNode);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.Null(node.Tag);
            Assert.Equal(expectedText, node.Text);
            Assert.Empty(node.ToolTipText);
            Assert.Null(node.TreeView);
        }

        [WinFormsTheory]
        [InlineData(null, -1, -1, "")]
        [InlineData(null, 0, 0, "")]
        [InlineData("text", 1, 1, "text")]
        [InlineData("text", 1, 14, "text")]
        public void TreeNode_Ctor_String_Int_Int(string text, int imageIndex, int selectedImageIndex, string expectedText)
        {
            var node = new TreeNode(text, imageIndex, selectedImageIndex);
            Assert.Equal(Color.Empty, node.BackColor);
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(node.Checked);
            Assert.Null(node.ContextMenuStrip);
            Assert.Null(node.FirstNode);
            Assert.Equal(Color.Empty, node.ForeColor);
            Assert.Throws<InvalidOperationException>(() => node.FullPath);
            Assert.Equal(imageIndex, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.Equal(0, node.Index);
            Assert.False(node.IsEditing);
            Assert.False(node.IsExpanded);
            Assert.False(node.IsSelected);
            Assert.False(node.IsVisible);
            Assert.Null(node.LastNode);
            Assert.Equal(0, node.Level);
            Assert.Empty(node.Name);
            Assert.Null(node.NextNode);
            Assert.Null(node.NextVisibleNode);
            Assert.Null(node.NodeFont);
            Assert.Empty(node.Nodes);
            Assert.Same(node.Nodes, node.Nodes);
            Assert.Null(node.Parent);
            Assert.Null(node.PrevNode);
            Assert.Null(node.PrevVisibleNode);
            Assert.Equal(selectedImageIndex, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.Null(node.Tag);
            Assert.Equal(expectedText, node.Text);
            Assert.Empty(node.ToolTipText);
            Assert.Null(node.TreeView);
        }

        [WinFormsFact]
        public void TreeNode_Ctor_String_Int_Int_TreeNodeArray()
        {
            // Work around: We cannot serialize type System.Windows.Forms.TreeNode[] because it lives in the GAC.
            TreeNode_Ctor_String_Int_Int_TreeNodeArray_Helper(null, -1, -1, Array.Empty<TreeNode>(), "");
            TreeNode_Ctor_String_Int_Int_TreeNodeArray_Helper(null, 0, 0, Array.Empty<TreeNode>(), "");
            TreeNode_Ctor_String_Int_Int_TreeNodeArray_Helper("text", 1, 1, new TreeNode[] { new TreeNode() }, "text");
            TreeNode_Ctor_String_Int_Int_TreeNodeArray_Helper("text", 1, 14, new TreeNode[] { new TreeNode(), new TreeNode("text") }, "text");
        }

        private void TreeNode_Ctor_String_Int_Int_TreeNodeArray_Helper(string text, int imageIndex, int selectedImageIndex, TreeNode[] children, string expectedText)
        {
            var node = new TreeNode(text, imageIndex, selectedImageIndex, children);
            Assert.Equal(Color.Empty, node.BackColor);
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(node.Checked);
            Assert.Null(node.ContextMenuStrip);
            Assert.Same(children.FirstOrDefault(), node.FirstNode);
            Assert.Equal(Color.Empty, node.ForeColor);
            Assert.Throws<InvalidOperationException>(() => node.FullPath);
            Assert.Equal(imageIndex, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.Equal(0, node.Index);
            Assert.False(node.IsEditing);
            Assert.False(node.IsExpanded);
            Assert.False(node.IsSelected);
            Assert.False(node.IsVisible);
            Assert.Same(children.LastOrDefault(), node.LastNode);
            Assert.Equal(0, node.Level);
            Assert.Empty(node.Name);
            Assert.Null(node.NextNode);
            Assert.Null(node.NextVisibleNode);
            Assert.Null(node.NodeFont);
            Assert.Equal(children, node.Nodes.Cast<TreeNode>());
            Assert.Same(node.Nodes, node.Nodes);
            Assert.Null(node.Parent);
            Assert.Null(node.PrevNode);
            Assert.Null(node.PrevVisibleNode);
            Assert.Equal(selectedImageIndex, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.Null(node.Tag);
            Assert.Equal(expectedText, node.Text);
            Assert.Empty(node.ToolTipText);
            Assert.Null(node.TreeView);
        }

        [WinFormsFact]
        public void TreeNode_Ctor_NullChildren_ThrowsArgumentNullException()
        {
            Assert.Throws<ArgumentNullException>("nodes", () => new TreeNode("text", null));
            Assert.Throws<ArgumentNullException>("nodes", () => new TreeNode("text", 0, 0, null));
        }

        [WinFormsFact]
        public void TreeNode_Ctor_NullValueInChildren_ThrowsArgumentNullException()
        {
            Assert.Throws<ArgumentNullException>("node", () => new TreeNode("text", new TreeNode[] { null }));
            Assert.Throws<ArgumentNullException>("node", () => new TreeNode("text", 0, 0, new TreeNode[] { null }));
        }

        [WinFormsTheory]
        [InlineData(-3)]
        public void TreeNode_Ctor_InvalidImageIndex_ThrowsArgumentOutOfRangeException(int imageIndex)
        {
            Assert.Throws<ArgumentOutOfRangeException>("value", () => new TreeNode("text", imageIndex, 0));
            Assert.Throws<ArgumentOutOfRangeException>("value", () => new TreeNode("text", imageIndex, 0, Array.Empty<TreeNode>()));
        }

        [WinFormsTheory]
        [InlineData(-3)]
        public void TreeNode_Ctor_InvalidSelectedImageIndex_ThrowsArgumentOutOfRangeException(int selectedImageIndex)
        {
            Assert.Throws<ArgumentOutOfRangeException>("value", () => new TreeNode("text", 0, selectedImageIndex));
            Assert.Throws<ArgumentOutOfRangeException>("value", () => new TreeNode("text", 0, selectedImageIndex, Array.Empty<TreeNode>()));
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_BackColor_Set_GetReturnsExpected(Color value)
        {
            var node = new TreeNode
            {
                BackColor = value
            };
            Assert.Equal(value, node.BackColor);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_BackColor_SetWithTreeView_GetReturnsExpected(Color value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> BackColor_SetWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { Color.Empty, 0 };
            yield return new object[] { Color.Red, 1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(BackColor_SetWithTreeViewWithHandle_TestData))]
        public void TreeNode_BackColor_SetWithTreeViewWithHandle_GetReturnsExpected(Color value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        public static IEnumerable<object[]> BackColor_SetWithCustomOldValue_TestData()
        {
            yield return new object[] { Color.Empty };
            yield return new object[] { Color.Blue };
            yield return new object[] { Color.Red };
        }

        [WinFormsTheory]
        [MemberData(nameof(BackColor_SetWithCustomOldValue_TestData))]
        public void TreeNode_BackColor_SetWithCustomOldValue_GetReturnsExpected(Color value)
        {
            var node = new TreeNode
            {
                BackColor = Color.Blue
            };

            node.BackColor = value;
            Assert.Equal(value, node.BackColor);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_BackColor_SetWithCustomOldValueWithTreeView_GetReturnsExpected(Color value)
        {
            using var control = new TreeView();
            var node = new TreeNode
            {
                BackColor = Color.Blue
            };
            control.Nodes.Add(node);

            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> BackColor_SetWithCustomOldValueWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { Color.Empty, 1 };
            yield return new object[] { Color.Red, 1 };
            yield return new object[] { Color.Blue, 0 };
        }

        [WinFormsTheory]
        [MemberData(nameof(BackColor_SetWithCustomOldValueWithTreeViewWithHandle_TestData))]
        public void TreeNode_BackColor_SetWithCustomOldValueWithTreeViewWithHandle_GetReturnsExpected(Color value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            var node = new TreeNode
            {
                BackColor = Color.Blue
            };
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.BackColor = value;
            Assert.Equal(value, node.BackColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_BackColor_ResetValue_Success()
        {
            PropertyDescriptor property = TypeDescriptor.GetProperties(typeof(TreeNode))[nameof(TreeNode.BackColor)];
            var node = new TreeNode();
            Assert.False(property.CanResetValue(node));

            node.BackColor = Color.Red;
            Assert.Equal(Color.Red, node.BackColor);
            Assert.False(property.CanResetValue(node));

            property.ResetValue(node);
            Assert.Equal(Color.Red, node.BackColor);
            Assert.False(property.CanResetValue(node));
        }

        [WinFormsFact]
        public void TreeNode_BackColor_ShouldSerializeValue_Success()
        {
            PropertyDescriptor property = TypeDescriptor.GetProperties(typeof(TreeNode))[nameof(TreeNode.BackColor)];
            var node = new TreeNode();
            Assert.False(property.ShouldSerializeValue(node));

            node.BackColor = Color.Red;
            Assert.Equal(Color.Red, node.BackColor);
            Assert.True(property.ShouldSerializeValue(node));

            property.ResetValue(node);
            Assert.Equal(Color.Red, node.BackColor);
            Assert.True(property.ShouldSerializeValue(node));
        }

        [WinFormsFact]
        public void TreeNode_Bounds_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Rectangle bounds = node.Bounds;
            Assert.True(bounds.X > 0);
            Assert.Equal(0, bounds.Y);
            Assert.True(bounds.Width > 0);
            Assert.True(bounds.Height > 0);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_Bounds_GetWithTreeViewWithHandle_Success()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Rectangle bounds = node.Bounds;
            Assert.True(bounds.X > 0);
            Assert.Equal(0, bounds.Y);
            Assert.True(bounds.Width > 0);
            Assert.True(bounds.Height > 0);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        public static IEnumerable<object[]> Bounds_Get_CustomGetItemRect_TestData()
        {
            yield return new object[] { new RECT(), Rectangle.Empty };
            yield return new object[] { new RECT(1, 2, 3, 4), new Rectangle(1, 2, 2, 2) };

            yield return new object[] { new RECT(0, 1, 3, 4), new Rectangle(0, 1, 3, 3) };
            yield return new object[] { new RECT(1, 0, 3, 4), new Rectangle(1, 0, 2, 4) };
            yield return new object[] { new RECT(1, 2, 0, 4), new Rectangle(1, 2, -1, 2) };
            yield return new object[] { new RECT(1, 2, 3, 0), new Rectangle(1, 2, 2, -2) };
            yield return new object[] { new RECT(0, 0, 3, 4), new Rectangle(0, 0, 3, 4) };

            yield return new object[] { new RECT(-1, 0, 3, 4), new Rectangle(-1, 0, 4, 4) };
            yield return new object[] { new RECT(1, -2, 3, 4), new Rectangle(1, -2, 2, 6) };
            yield return new object[] { new RECT(1, 2, -3, 4), new Rectangle(1, 2, -4, 2) };
            yield return new object[] { new RECT(1, 2, 3, -4), new Rectangle(1, 2, 2, -6) };
            yield return new object[] { new RECT(-3, -4, -1, -2), new Rectangle(-3, -4, 2, 2) };

            yield return new object[] { new RECT(1, 118, 3, 4), new Rectangle(1, 118, 2, -114) };
            yield return new object[] { new RECT(1, 117, 3, 4), new Rectangle(1, 117, 2, -113) };
            yield return new object[] { new RECT(94, 2, 3, 4), new Rectangle(94, 2, -91, 2) };
            yield return new object[] { new RECT(93, 2, 3, 4), new Rectangle(93, 2, -90, 2) };
        }

        [WinFormsTheory]
        [MemberData(nameof(Bounds_Get_CustomGetItemRect_TestData))]
        public void TreeNode_Bounds_GetCustomGetItemRect_ReturnsExpected(object getItemRectResult, Rectangle expected)
        {
            using var control = new CustomGetItemRectTreeView
            {
                GetItemRectResult = (RECT)getItemRectResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            Assert.Equal(expected, node.Bounds);
        }

        [WinFormsFact]
        public void TreeNode_Bounds_GetInvalidGetItemRect_ReturnsExpected()
        {
            using var control = new InvalidGetItemRectTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.MakeInvalid = true;

            Assert.Equal(Rectangle.Empty, node.Bounds);
        }

        [WinFormsFact]
        public void TreeNode_Bounds_GetWithTreeViewDisposed_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.Equal(Rectangle.Empty, node.Bounds);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetBoolTheoryData))]
        public void TreeNode_Checked_Set_GetReturnsExpected(bool value)
        {
            var node = new TreeNode
            {
                Checked = value
            };
            Assert.Equal(value, node.Checked);

            // Set same
            node.Checked = value;
            Assert.Equal(value, node.Checked);

            // Set different
            node.Checked = !value;
            Assert.Equal(!value, node.Checked);
        }

        [WinFormsTheory]
        [InlineData(true, true)]
        [InlineData(true, false)]
        [InlineData(false, true)]
        [InlineData(false, false)]
        public void TreeNode_Checked_SetWithTreeView_GetReturnsExpected(bool checkBoxes, bool value)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.False(control.IsHandleCreated);

            // Set different
            node.Checked = !value;
            Assert.Equal(!value, node.Checked);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(true, true)]
        [InlineData(true, false)]
        [InlineData(false, true)]
        [InlineData(false, false)]
        public void TreeNode_Checked_SetWithTreeViewWithHandle_GetReturnsExpected(bool checkBoxes, bool value)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same
            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set different
            node.Checked = !value;
            Assert.Equal(!value, node.Checked);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(true, true, 8192)]
        [InlineData(true, false, 4096)]
        [InlineData(false, true, 8192)]
        [InlineData(false, false, 4096)]
        public void TreeNode_Checked_GetItemState_ReturnsExpected(bool checkBoxes, bool @checked, int expectedValue)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.Checked = @checked;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, IntPtr.Zero, ref item));
            Assert.Equal((TVIS)expectedValue, item.state);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetBoolTheoryData))]
        public void TreeNode_Checked_SetWithTreeViewDisposed_GetReturnsExpected(bool value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.Checked = value;
            Assert.Equal(value, node.Checked);
            Assert.False(control.IsHandleCreated);

            // Set different
            node.Checked = !value;
            Assert.Equal(!value, node.Checked);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_ForeColor_Set_GetReturnsExpected(Color value)
        {
            var node = new TreeNode
            {
                ForeColor = value
            };
            Assert.Equal(value, node.ForeColor);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_ForeColor_SetWithTreeView_GetReturnsExpected(Color value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> ForeColor_SetWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { Color.Empty, 0 };
            yield return new object[] { Color.Red, 1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(ForeColor_SetWithTreeViewWithHandle_TestData))]
        public void TreeNode_ForeColor_SetWithTreeViewWithHandle_GetReturnsExpected(Color value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        public static IEnumerable<object[]> ForeColor_SetWithCustomOldValue_TestData()
        {
            yield return new object[] { Color.Empty };
            yield return new object[] { Color.Blue };
            yield return new object[] { Color.Red };
        }

        [WinFormsTheory]
        [MemberData(nameof(ForeColor_SetWithCustomOldValue_TestData))]
        public void TreeNode_ForeColor_SetWithCustomOldValue_GetReturnsExpected(Color value)
        {
            var node = new TreeNode
            {
                ForeColor = Color.Blue
            };

            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetColorWithEmptyTheoryData))]
        public void TreeNode_ForeColor_SetWithCustomOldValueWithTreeView_GetReturnsExpected(Color value)
        {
            using var control = new TreeView();
            var node = new TreeNode
            {
                ForeColor = Color.Blue
            };
            control.Nodes.Add(node);

            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> ForeColor_SetWithCustomOldValueWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { Color.Empty, 1 };
            yield return new object[] { Color.Red, 1 };
            yield return new object[] { Color.Blue, 0 };
        }

        [WinFormsTheory]
        [MemberData(nameof(ForeColor_SetWithCustomOldValueWithTreeViewWithHandle_TestData))]
        public void TreeNode_ForeColor_SetWithCustomOldValueWithTreeViewWithHandle_GetReturnsExpected(Color value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            var node = new TreeNode
            {
                ForeColor = Color.Blue
            };
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.ForeColor = value;
            Assert.Equal(value, node.ForeColor);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_ForeColor_ResetValue_Success()
        {
            PropertyDescriptor property = TypeDescriptor.GetProperties(typeof(TreeNode))[nameof(TreeNode.ForeColor)];
            var node = new TreeNode();
            Assert.False(property.CanResetValue(node));

            node.ForeColor = Color.Red;
            Assert.Equal(Color.Red, node.ForeColor);
            Assert.False(property.CanResetValue(node));

            property.ResetValue(node);
            Assert.Equal(Color.Red, node.ForeColor);
            Assert.False(property.CanResetValue(node));
        }

        [WinFormsFact]
        public void TreeNode_ForeColor_ShouldSerializeValue_Success()
        {
            PropertyDescriptor property = TypeDescriptor.GetProperties(typeof(TreeNode))[nameof(TreeNode.ForeColor)];
            var node = new TreeNode();
            Assert.False(property.ShouldSerializeValue(node));

            node.ForeColor = Color.Red;
            Assert.Equal(Color.Red, node.ForeColor);
            Assert.True(property.ShouldSerializeValue(node));

            property.ResetValue(node);
            Assert.Equal(Color.Red, node.ForeColor);
            Assert.True(property.ShouldSerializeValue(node));
        }

        [WinFormsFact]
        public void TreeNode_Handle_GetWithoutTreeView_ReturnsExpected()
        {
            var node = new TreeNode();
            IntPtr handle = node.Handle;
            Assert.Equal(IntPtr.Zero, handle);
            Assert.Equal(handle, node.Handle);
        }

        [WinFormsFact]
        public void TreeNode_Handle_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            IntPtr handle = node.Handle;
            Assert.NotEqual(IntPtr.Zero, handle);
            Assert.Equal(handle, node.Handle);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(true, true, 8192)]
        [InlineData(true, false, 4096)]
        [InlineData(false, true, 0)]
        [InlineData(false, false, 0)]
        public void TreeNode_Handle_GetChecked_ReturnsExpected(bool checkBoxes, bool @checked, int expectedValue)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode
            {
                Checked = @checked
            };
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, IntPtr.Zero, ref item));
            Assert.Equal((TVIS)expectedValue, item.state);
        }

        [WinFormsFact]
        public void TreeNode_Handle_GetWithTreeViewDisposed_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();
            IntPtr handle = node.Handle;
            Assert.NotEqual(IntPtr.Zero, handle);
            Assert.Equal(handle, node.Handle);
            Assert.False(control.IsHandleCreated);
        }
        public static IEnumerable<object[]> TreeNode_ImageIndex_TestData()
        {
            // { image index, expected index without image, expected index with image }
            yield return new object[] { -2, -2, -2 };
            yield return new object[] { -1, -1, -1 };
            yield return new object[] { 0, -1, 0 };
            yield return new object[] { 1, -1, 0 };
            yield return new object[] { 2, -1, 0 };
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_ImageIndex_SetWithoutTreeView_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            var node = new TreeNode
            {
                ImageIndex = value
            };
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_ImageIndex_SetWithImageKey_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            var node = new TreeNode
            {
                ImageKey = "ImageKey",
                ImageIndex = value
            };
            Assert.Equal(value, node.ImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.ImageKey);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.ImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.ImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.ImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_ImageIndex_SetWithTreeView_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_ImageIndex_SetWithTreeViewWithEmptyList_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageIndex = value;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-2, -2)]
        [InlineData(-1, -1)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 1)]
        public void TreeNode_ImageIndex_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageIndex = value;
            Assert.Equal(expected, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(expected, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_ImageIndex_SetWithTreeViewWithHandle_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.ImageIndex);
            Assert.Empty(node.ImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(1, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        public void TreeNode_ImageIndex_GetItemWithoutImageList_Success(int value, int expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iImage);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 2)]
        public void TreeNode_ImageIndex_GetItemWithEmptyImageList_Success(int value, int expected)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iImage);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 2)]
        public void TreeNode_ImageIndex_GetItemWithImageList_Success(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iImage);
        }

        [WinFormsTheory]
        [InlineData(-2)]
        [InlineData(-1)]
        [InlineData(0)]
        [InlineData(1)]
        public void TreeNode_ImageIndex_SetWithTreeViewDisposed_GetReturnsExpected(int value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.ImageIndex = value;
            Assert.Equal(value, node.ImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-3)]
        public void TreeNode_ImageIndex_SetInvalid_ThrowsArgumentOutOfRangeException(int value)
        {
            var node = new TreeNode();
            Assert.Throws<ArgumentOutOfRangeException>("value", () => node.ImageIndex = value);
        }

        [WinFormsFact]
        public void TreeNode_ImageIndex_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.ImageIndex = 0;
            Assert.Equal(0, node.ImageIndex);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_ImageKey_SetWithoutTreeView_GetReturnsExpected(string value, string expected)
        {
            var node = new TreeNode
            {
                ImageKey = value
            };
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
        }

        [WinFormsTheory]
        [InlineData(null, "")]
        [InlineData("", "")]
        [InlineData("ImageKey", "ImageKey")]
        public void TreeNode_ImageKey_SetWithImageIndex_GetReturnsExpected(string value, string expectedImageKey)
        {
            var node = new TreeNode
            {
                ImageIndex = 0,
                ImageKey = value
            };
            Assert.Equal(expectedImageKey, node.ImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.ImageIndex);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expectedImageKey, node.ImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.ImageIndex);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_ImageKey_SetWithTreeView_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_ImageKey_SetWithTreeViewWithEmptyList_GetReturnsExpected(string value, string expected)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(null, "")]
        [InlineData("", "")]
        [InlineData("Image1", "Image1")]
        [InlineData("image1", "image1")]
        [InlineData("Image2", "Image2")]
        [InlineData("NoSuchImage", "NoSuchImage")]
        public void TreeNode_ImageKey_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(string value, string expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_ImageKey_SetWithTreeViewWithHandle_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.Equal(-1, node.ImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(null)]
        [InlineData("")]
        [InlineData("Image1")]
        [InlineData("image1")]
        [InlineData("Image2")]
        [InlineData("NoSuchImage")]
        public void TreeNode_ImageKey_GetItemWithoutImageList_Success(string value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(0, column.iImage);
        }

        [WinFormsTheory]
        [InlineData(null, 0)]
        [InlineData("", 0)]
        [InlineData("Image1", 0)]
        [InlineData("image1", 0)]
        [InlineData("Image2", 0)]
        [InlineData("NoSuchImage", 0)]
        public void TreeNode_ImageKey_GetItemWithEmptyImageList_Success(string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(expected, column.iImage);
        }

        [WinFormsTheory]
        [InlineData(null, 0)]
        [InlineData("", 0)]
        [InlineData("Image1", 0)]
        [InlineData("image1", 0)]
        [InlineData("Image2", 1)]
        [InlineData("NoSuchImage", 0)]
        public void TreeNode_ImageKey_GetItemWithImageList_Success(string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.ImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(expected, column.iImage);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_ImageKey_SetWithTreeViewDisposed_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.ImageKey = value;
            Assert.Equal(expected, node.ImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_ImageKey_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.ImageKey = "Key";
            Assert.Equal("Key", node.ImageKey);
        }

        [WinFormsFact]
        public void TreeNode_Index_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Equal(0, node.Index);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_Index_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(0, node.Index);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_Index_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Equal(0, node1.Index);
            Assert.Equal(1, node2.Index);
            Assert.Equal(2, node3.Index);
            Assert.Equal(0, node4.Index);
        }

        [WinFormsFact]
        public void TreeView_Index_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Equal(0, node1.Index);
            Assert.Equal(1, node2.Index);
            Assert.Equal(2, node3.Index);
            Assert.Equal(0, node4.Index);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_Index_GetWithParentWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(0, node1.Index);
            Assert.Equal(1, node2.Index);
            Assert.Equal(2, node3.Index);
            Assert.Equal(0, node4.Index);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_IsEditing_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.False(node.IsEditing);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsEditing_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.False(node.IsEditing);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_IsEditing_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.False(node.IsEditing);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsExpanded_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.False(node.IsExpanded);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsExpanded_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.False(node.IsExpanded);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(0, false)]
        [InlineData((int)TVIS.BOLD, false)]
        [InlineData((int)TVIS.EXPANDED, true)]
        [InlineData((int)(TVIS.EXPANDED | TVIS.BOLD), true)]
        [InlineData((int)TVIS.EXPANDEDONCE, false)]
        public void TreeNode_IsExpanded_GetCustomGetItem_ReturnsExpected(int getItemStateResult, bool expected)
        {
            using var control = new CustomGetItemTreeView
            {
                GetItemStateResult = (TVIS)getItemStateResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            Assert.Equal(expected, node.IsExpanded);
        }

        [WinFormsTheory]
        [InlineData(0, false)]
        [InlineData((int)TVIS.BOLD, false)]
        [InlineData((int)TVIS.EXPANDED, true)]
        [InlineData((int)(TVIS.EXPANDED | TVIS.BOLD), true)]
        [InlineData((int)TVIS.EXPANDEDONCE, false)]
        public void TreeNode_IsExpanded_GetInvalidGetItem_ReturnsExpected(int getItemStateResult, bool expected)
        {
            using var control = new InvalidGetItemTreeView
            {
                GetItemStateResult = (TVIS)getItemStateResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            Assert.Equal(expected, node.IsExpanded);
        }

        [WinFormsFact]
        public void TreeNode_IsExpanded_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.False(node.IsExpanded);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsSelected_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.False(node.IsSelected);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsSelected_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.False(node.IsSelected);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(0, false)]
        [InlineData((int)TVIS.BOLD, false)]
        [InlineData((int)TVIS.SELECTED, true)]
        [InlineData((int)(TVIS.SELECTED | TVIS.BOLD), true)]
        public void TreeNode_IsSelected_GetCustomGetItem_ReturnsExpected(int getItemStateResult, bool expected)
        {
            using var control = new CustomGetItemTreeView
            {
                GetItemStateResult = (TVIS)getItemStateResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            Assert.Equal(expected, node.IsSelected);
        }

        [WinFormsTheory]
        [InlineData(0, false)]
        [InlineData((int)TVIS.BOLD, false)]
        [InlineData((int)TVIS.SELECTED, true)]
        [InlineData((int)(TVIS.SELECTED | TVIS.BOLD), true)]
        public void TreeNode_IsSelected_GetInvalidGetItem_ReturnsExpected(int getItemStateResult, bool expected)
        {
            using var control = new InvalidGetItemTreeView
            {
                GetItemStateResult = (TVIS)getItemStateResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            Assert.Equal(expected, node.IsSelected);
        }

        [WinFormsFact]
        public void TreeNode_IsSelected_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.False(node.IsSelected);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsVisible_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.False(node.IsVisible);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_IsVisible_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.True(node.IsVisible);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        public static IEnumerable<object[]> IsVisible_Get_CustomGetItemRect_TestData()
        {
            yield return new object[] { new RECT(), false };
            yield return new object[] { new RECT(1, 2, 3, 4), true };

            yield return new object[] { new RECT(0, 1, 3, 4), true };
            yield return new object[] { new RECT(1, 0, 3, 4), true };
            yield return new object[] { new RECT(1, 2, 0, 4), false };
            yield return new object[] { new RECT(1, 2, 3, 0), false };
            yield return new object[] { new RECT(0, 0, 3, 4), true };

            yield return new object[] { new RECT(-1, 0, 3, 4), true };
            yield return new object[] { new RECT(1, -2, 3, 4), true };
            yield return new object[] { new RECT(1, 2, -3, 4), false };
            yield return new object[] { new RECT(1, 2, 3, -4), false };
            yield return new object[] { new RECT(-3, -4, -1, -2), false };

            yield return new object[] { new RECT(1, 118, 3, 4), false };
            yield return new object[] { new RECT(1, 117, 3, 4), false };
            yield return new object[] { new RECT(94, 2, 3, 4), true };
            yield return new object[] { new RECT(93, 2, 3, 4), true };
        }

        [WinFormsTheory]
        [MemberData(nameof(IsVisible_Get_CustomGetItemRect_TestData))]
        public void TreeNode_IsVisible_GetCustomGetItemRect_ReturnsExpected(object getItemRectResult, bool expected)
        {
            using var control = new CustomGetItemRectTreeView
            {
                GetItemRectResult = (RECT)getItemRectResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            Assert.Equal(expected, node.IsVisible);
        }

        [WinFormsFact]
        public void TreeNode_IsVisible_GetInvalidGetItemRect_ReturnsExpected()
        {
            using var control = new InvalidGetItemRectTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.MakeInvalid = true;

            Assert.False(node.IsVisible);
        }

        [WinFormsFact]
        public void TreeNode_IsVisible_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.False(node.IsVisible);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_Level_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Equal(0, node.Level);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_Level_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(0, node.Level);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_Level_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Equal(1, node1.Level);
            Assert.Equal(1, node2.Level);
            Assert.Equal(1, node3.Level);
            Assert.Equal(2, node4.Level);
        }

        [WinFormsFact]
        public void TreeView_Level_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Equal(1, node1.Level);
            Assert.Equal(1, node2.Level);
            Assert.Equal(1, node3.Level);
            Assert.Equal(2, node4.Level);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_Level_GetWithParentWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(1, node1.Level);
            Assert.Equal(1, node2.Level);
            Assert.Equal(1, node3.Level);
            Assert.Equal(2, node4.Level);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_Name_Set_GetReturnsExpected(string value, string expected)
        {
            var node = new TreeNode
            {
                Name = value
            };
            Assert.Equal(expected, node.Name);

            // Set same.
            node.Name = value;
            Assert.Equal(expected, node.Name);
        }

        [WinFormsFact]
        public void TreeNode_NextNode_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Null(node.NextNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_NextNode_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node.NextNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_NextNode_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Equal(node2, node1.NextNode);
            Assert.Equal(node3, node2.NextNode);
            Assert.Null(node3.NextNode);
            Assert.Null(node4.NextNode);
        }

        [WinFormsFact]
        public void TreeView_NextNode_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Equal(node2, node1.NextNode);
            Assert.Equal(node3, node2.NextNode);
            Assert.Null(node3.NextNode);
            Assert.Null(node4.NextNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_NextNode_GetWithParentWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(node2, node1.NextNode);
            Assert.Equal(node3, node2.NextNode);
            Assert.Null(node3.NextNode);
            Assert.Null(node4.NextNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_NextVisibleNode_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Null(node.NextVisibleNode);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_NextVisibleNode_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node.NextVisibleNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_NextVisibleNode_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.Null(node.NextVisibleNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_NextVisibleNode_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Null(node1.NextVisibleNode);
            Assert.Null(node2.NextVisibleNode);
            Assert.Null(node3.NextVisibleNode);
            Assert.Null(node4.NextVisibleNode);
        }

        [WinFormsFact]
        public void TreeView_NextVisibleNode_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Null(node1.NextVisibleNode);
            Assert.Null(node2.NextVisibleNode);
            Assert.Null(node3.NextVisibleNode);
            Assert.Null(node4.NextVisibleNode);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_NextVisibleNode_GetWithParentWithTreeViewWithHanlde_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node1.NextVisibleNode);
            Assert.Null(node2.NextVisibleNode);
            Assert.Null(node3.NextVisibleNode);
            Assert.Null(node4.NextVisibleNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_NextVisibleNode_GetCustomGetNextItem_ReturnsExpected()
        {
            using var control = new CustomGetNextItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeCustom = true;
            control.GetNextItemResult = node.Handle;
            try
            {
                Assert.Same(node, node.NextVisibleNode);
            }
            finally
            {
                control.MakeCustom = false;
            }
        }

        public static IEnumerable<object[]> NextVisibleNode_InvalidGetNextItem_TestData()
        {
            yield return new object[] { IntPtr.Zero };
            yield return new object[] { (IntPtr)1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(NextVisibleNode_InvalidGetNextItem_TestData))]
        public void TreeNode_NextVisibleNode_GetInvalidGetNextItem_ReturnsExpected(IntPtr getNextItemResult)
        {
            using var control = new CustomGetNextItemTreeView
            {
                GetNextItemResult = getNextItemResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeCustom = true;
            try
            {
                Assert.Null(node.NextVisibleNode);
            }
            finally
            {
                control.MakeCustom = false;
            }
        }

        private class CustomGetNextItemTreeView : TreeView
        {
            public IntPtr GetNextItemResult { get; set; }
            public bool MakeCustom { get; set; }

            protected override void WndProc(ref Message m)
            {
                if (MakeCustom && m.Msg == (int)TVM.GETNEXTITEM)
                {
                    Assert.Equal((IntPtr)TVGN.NEXTVISIBLE, m.WParam);
                    Assert.NotEqual(IntPtr.Zero, m.LParam);
                    m.Result = GetNextItemResult;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        [WinFormsFact]
        public void TreeNode_Parent_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Null(node.Parent);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_Parent_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node.Parent);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_Parent_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Equal(parent, node1.Parent);
            Assert.Equal(parent, node2.Parent);
            Assert.Equal(parent, node3.Parent);
            Assert.Equal(node3, node4.Parent);
        }

        [WinFormsFact]
        public void TreeView_Parent_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Equal(parent, node1.Parent);
            Assert.Equal(parent, node2.Parent);
            Assert.Equal(parent, node3.Parent);
            Assert.Equal(node3, node4.Parent);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_Parent_GetWithParentWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Equal(parent, node1.Parent);
            Assert.Equal(parent, node2.Parent);
            Assert.Equal(parent, node3.Parent);
            Assert.Equal(node3, node4.Parent);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_PrevNode_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Null(node.PrevNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_PrevNode_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node.PrevNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_PrevNode_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Null(node1.PrevNode);
            Assert.Equal(node1, node2.PrevNode);
            Assert.Equal(node2, node3.PrevNode);
            Assert.Null(node4.PrevNode);
        }

        [WinFormsFact]
        public void TreeView_PrevNode_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Null(node1.PrevNode);
            Assert.Equal(node1, node2.PrevNode);
            Assert.Equal(node2, node3.PrevNode);
            Assert.Null(node4.PrevNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_PrevNode_GetWithParentWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node1.PrevNode);
            Assert.Equal(node1, node2.PrevNode);
            Assert.Equal(node2, node3.PrevNode);
            Assert.Null(node4.PrevNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_PrevVisibleNode_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Null(node.PrevVisibleNode);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_PrevVisibleNode_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node.PrevVisibleNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_PrevVisibleNode_GetWithTreeViewDisposed_ReturnsFalse()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.Dispose();
            Assert.Null(node.PrevVisibleNode);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_PrevVisibleNode_GetWithParent_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Null(node1.PrevVisibleNode);
            Assert.Null(node2.PrevVisibleNode);
            Assert.Null(node3.PrevVisibleNode);
            Assert.Null(node4.PrevVisibleNode);
        }

        [WinFormsFact]
        public void TreeView_PrevVisibleNode_GetWithParentWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Null(node1.PrevVisibleNode);
            Assert.Null(node2.PrevVisibleNode);
            Assert.Null(node3.PrevVisibleNode);
            Assert.Null(node4.PrevVisibleNode);
            Assert.True(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_PrevVisibleNode_GetWithParentWithTreeViewWithHanlde_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Null(node1.PrevVisibleNode);
            Assert.Null(node2.PrevVisibleNode);
            Assert.Null(node3.PrevVisibleNode);
            Assert.Null(node4.PrevVisibleNode);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeNode_PrevVisibleNode_GetCustomGetPreviousItem_ReturnsExpected()
        {
            using var control = new CustomGetPreviousItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeCustom = true;
            control.GetPreviousItemResult = node.Handle;
            try
            {
                Assert.Same(node, node.PrevVisibleNode);
            }
            finally
            {
                control.MakeCustom = false;
            }
        }

        public static IEnumerable<object[]> PrevVisibleNode_InvalidGetPreviousItemResult_TestData()
        {
            yield return new object[] { IntPtr.Zero };
            yield return new object[] { (IntPtr)1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(PrevVisibleNode_InvalidGetPreviousItemResult_TestData))]
        public void TreeNode_PrevVisibleNode_InvalidGetPreviousItemResult_ReturnsExpected(IntPtr getPreviousItemResult)
        {
            using var control = new CustomGetPreviousItemTreeView
            {
                GetPreviousItemResult = getPreviousItemResult
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeCustom = true;
            try
            {
                Assert.Null(node.PrevVisibleNode);
            }
            finally
            {
                control.MakeCustom = false;
            }
        }

        private class CustomGetPreviousItemTreeView : TreeView
        {
            public IntPtr GetPreviousItemResult { get; set; }
            public bool MakeCustom { get; set; }

            protected override void WndProc(ref Message m)
            {
                if (MakeCustom && m.Msg == (int)TVM.GETNEXTITEM)
                {
                    Assert.Equal((IntPtr)TVGN.PREVIOUSVISIBLE, m.WParam);
                    Assert.NotEqual(IntPtr.Zero, m.LParam);
                    m.Result = GetPreviousItemResult;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetFontTheoryData))]
        public void TreeNode_NodeFont_Set_GetReturnsExpected(Font value)
        {
            var node = new TreeNode
            {
                NodeFont = value
            };
            Assert.Equal(value, node.NodeFont);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetFontTheoryData))]
        public void TreeNode_NodeFont_SetWithTreeView_GetReturnsExpected(Font value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> NodeFont_SetWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { null, 0 };
            yield return new object[] { new Font("Arial", 8.25f), 1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(NodeFont_SetWithTreeViewWithHandle_TestData))]
        public void TreeNode_NodeFont_SetWithTreeViewWithHandle_GetReturnsExpected(Font value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetFontTheoryData))]
        public void TreeNode_NodeFont_SetWithCustomOldValue_GetReturnsExpected(Font value)
        {
            using var oldValue = new Font("Arial", 1);
            var node = new TreeNode
            {
                NodeFont = oldValue
            };

            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetFontTheoryData))]
        public void TreeNode_NodeFont_SetWithCustomOldValueWithTreeView_GetReturnsExpected(Font value)
        {
            using var control = new TreeView();
            using var oldValue = new Font("Arial", 1);
            var node = new TreeNode
            {
                NodeFont = oldValue
            };
            control.Nodes.Add(node);

            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> NodeFont_SetWithCustomOldValueWithTreeViewWithHandle_TestData()
        {
            yield return new object[] { null, 1 };
            yield return new object[] { new Font("Arial", 8.25f), 1 };
        }

        [WinFormsTheory]
        [MemberData(nameof(NodeFont_SetWithCustomOldValueWithTreeViewWithHandle_TestData))]
        public void TreeNode_NodeFont_SetWithCustomOldValueWithTreeViewWithHandle_GetReturnsExpected(Font value, int expectedInvalidatedCallCount)
        {
            using var control = new TreeView();
            using var oldValue = new Font("Arial", 1);
            var node = new TreeNode
            {
                NodeFont = oldValue
            };
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.NodeFont = value;
            Assert.Equal(value, node.NodeFont);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(-1, -1)]
        [InlineData(0, 0)]
        [InlineData(1, 0)]
        [InlineData(2, 0)]
        public void TreeNode_SelectedImageIndex_SetWithoutTreeView_GetReturnsExpected(int value, int expectedWithImage)
        {
            var node = new TreeNode
            {
                SelectedImageIndex = value
            };
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_SelectedImageIndex_SetWithSelectedImageKey_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            var node = new TreeNode
            {
                SelectedImageKey = "SelectedImageKey",
                SelectedImageIndex = value
            };
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.SelectedImageKey);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.SelectedImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.SelectedImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.SelectedImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_SelectedImageIndex_SetWithTreeView_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_SelectedImageIndex_SetWithTreeViewWithEmptyList_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageIndex = value;
            Assert.Equal(expectedWithoutImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(expectedWithoutImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-2, -2)]
        [InlineData(-1, -1)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 1)]
        public void TreeNode_SelectedImageIndex_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageIndex = value;
            Assert.Equal(expected, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(expected, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(TreeNode_ImageIndex_TestData))]
        public void TreeNode_SelectedImageIndex_SetWithTreeViewWithHandle_GetReturnsExpected(int value, int expectedWithoutImage, int expectedWithImage)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Add image list.
            using var imageList = new ImageList();
            control.ImageList = imageList;
            Assert.Equal(expectedWithoutImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.SelectedImageIndex);
            Assert.Empty(node.SelectedImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(1, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 0)]
        public void TreeNode_SelectedImageIndex_GetItemWithoutImageList_Success(int value, int expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.IMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iSelectedImage);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 2)]
        public void TreeNode_SelectedImageIndex_GetItemWithEmptyImageList_Success(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.SELECTEDIMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iSelectedImage);
        }

        [WinFormsTheory]
        [InlineData(-2, 0)]
        [InlineData(-1, 0)]
        [InlineData(0, 0)]
        [InlineData(1, 1)]
        [InlineData(2, 2)]
        public void TreeNode_SelectedImageIndex_GetItemWithImageList_Success(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.SELECTEDIMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, item.iSelectedImage);
        }

        [WinFormsTheory]
        [InlineData(-2)]
        [InlineData(-1)]
        [InlineData(0)]
        [InlineData(1)]
        public void TreeNode_SelectedImageIndex_SetWithTreeViewDisposed_GetReturnsExpected(int value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.SelectedImageIndex = value;
            Assert.Equal(value, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-3)]
        public void TreeNode_SelectedImageIndex_SetInvalid_ThrowsArgumentOutOfRangeException(int value)
        {
            var node = new TreeNode();
            Assert.Throws<ArgumentOutOfRangeException>("value", () => node.SelectedImageIndex = value);
        }

        [WinFormsFact]
        public void TreeNode_SelectedImageIndex_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.SelectedImageIndex = 0;
            Assert.Equal(0, node.SelectedImageIndex);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_SelectedImageKey_SetWithoutTreeView_GetReturnsExpected(string value, string expected)
        {
            var node = new TreeNode
            {
                SelectedImageKey = value
            };
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
        }

        [WinFormsTheory]
        [InlineData(null, "")]
        [InlineData("", "")]
        [InlineData("SelectedImageKey", "SelectedImageKey")]
        public void TreeNode_SelectedImageKey_SetWithSelectedImageIndex_GetReturnsExpected(string value, string expectedSelectedImageKey)
        {
            var node = new TreeNode
            {
                SelectedImageIndex = 0,
                SelectedImageKey = value
            };
            Assert.Equal(expectedSelectedImageKey, node.SelectedImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.SelectedImageIndex);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expectedSelectedImageKey, node.SelectedImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.SelectedImageIndex);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_SelectedImageKey_SetWithTreeView_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_SelectedImageKey_SetWithTreeViewWithEmptyList_GetReturnsExpected(string value, string expected)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(null, "")]
        [InlineData("", "")]
        [InlineData("Image1", "Image1")]
        [InlineData("image1", "image1")]
        [InlineData("Image2", "Image2")]
        [InlineData("NoSuchImage", "NoSuchImage")]
        public void TreeNode_SelectedImageKey_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(string value, string expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_SelectedImageKey_SetWithTreeViewWithHandle_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.Equal(-1, node.SelectedImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(null)]
        [InlineData("")]
        [InlineData("Image1")]
        [InlineData("image1")]
        [InlineData("Image2")]
        [InlineData("NoSuchImage")]
        public void TreeNode_SelectedImageKey_GetItemWithoutImageList_Success(string value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.SELECTEDIMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(0, column.iSelectedImage);
        }

        [WinFormsTheory]
        [InlineData(null, 0)]
        [InlineData("", 0)]
        [InlineData("Image1", 0)]
        [InlineData("image1", 0)]
        [InlineData("Image2", 0)]
        [InlineData("NoSuchImage", 0)]
        public void TreeNode_SelectedImageKey_GetItemWithEmptyImageList_Success(string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.SELECTEDIMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(expected, column.iSelectedImage);
        }

        [WinFormsTheory]
        [InlineData(null, 0)]
        [InlineData("", 0)]
        [InlineData("Image1", 0)]
        [InlineData("image1", 0)]
        [InlineData("Image2", 1)]
        [InlineData("NoSuchImage", 0)]
        public void TreeNode_SelectedImageKey_GetItemWithImageList_Success(string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                ImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.SelectedImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.SELECTEDIMAGE,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal(expected, column.iSelectedImage);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_SelectedImageKey_SetWithTreeViewDisposed_GetReturnsExpected(string value, string expected)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.SelectedImageKey = value;
            Assert.Equal(expected, node.SelectedImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_SelectedImageKey_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.SelectedImageKey = "Key";
            Assert.Equal("Key", node.SelectedImageKey);
        }

        [WinFormsTheory]
        [InlineData(-1, -1)]
        [InlineData(0, 0)]
        [InlineData(1, 0)]
        [InlineData(2, 0)]
        [InlineData(14, 0)]
        public void TreeNode_StateImageIndex_SetWithoutTreeView_GetReturnsExpected(int value, int expectedWithImage)
        {
            var node = new TreeNode
            {
                StateImageIndex = value
            };
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-1, -1)]
        [InlineData(0, 0)]
        [InlineData(1, 0)]
        [InlineData(2, 0)]
        [InlineData(14, 0)]
        public void TreeNode_StateImageIndex_SetWithStateImageKey_GetReturnsExpected(int value, int expectedWithImage)
        {
            var node = new TreeNode
            {
                StateImageKey = "StateImageKey",
                StateImageIndex = value
            };
            Assert.Equal(value, node.StateImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.StateImageKey);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.StateImageKey);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(value, node.StateImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.StateImageIndex);
            Assert.Equal(ImageList.Indexer.DefaultKey, node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> StateImageIndex_SetWithTreeView_TestData()
        {
            foreach (bool checkBoxes in new bool[] { true, false })
            {
                yield return new object[] { checkBoxes, -1, -1 };
                yield return new object[] { checkBoxes, 0, 0 };
                yield return new object[] { checkBoxes, 1, 0 };
                yield return new object[] { checkBoxes, 2, 0 };
                yield return new object[] { checkBoxes, 14, 0 };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageIndex_SetWithTreeView_TestData))]
        public void TreeNode_StateImageIndex_SetWithTreeView_GetReturnsExpected(bool checkBoxes, int value, int expectedWithImage)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageIndex_SetWithTreeView_TestData))]
        public void TreeNode_StateImageIndex_SetWithTreeViewWithEmptyList_GetReturnsExpected(bool checkBoxes, int value, int expectedWithImage)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageIndex = value;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> StateImageIndex_SetWithTreeViewNotEmptyList_TestData()
        {
            foreach (bool checkBoxes in new bool[] { true, false })
            {
                yield return new object[] { checkBoxes, -1, -1 };
                yield return new object[] { checkBoxes, 0, 0 };
                yield return new object[] { checkBoxes, 1, 1 };
                yield return new object[] { checkBoxes, 2, 1 };
                yield return new object[] { checkBoxes, 14, 1 };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageIndex_SetWithTreeViewNotEmptyList_TestData))]
        public void TreeNode_StateImageIndex_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(bool checkBoxes, int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageIndex = value;
            Assert.Equal(expected, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(expected, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> StateImageIndex_SetWithTreeViewWithHandle_TestData()
        {
            foreach (bool checkBoxes in new bool[] { true, false })
            {
                yield return new object[] { checkBoxes, -1, checkBoxes ? 1 : 0 };
                yield return new object[] { checkBoxes, 0, checkBoxes ? 1 : 0 };
                yield return new object[] { checkBoxes, 1, checkBoxes ? 1 : 0 };
                yield return new object[] { checkBoxes, 2, checkBoxes ? 1 : 0 };
                yield return new object[] { checkBoxes, 14, checkBoxes ? 1 : 0 };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageIndex_SetWithTreeViewWithHandle_TestData))]
        public void TreeNode_StateImageIndex_SetWithTreeViewWithHandle_GetReturnsExpected(bool checkBoxes, int value, int expectedCreatedCallCount)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(expectedCreatedCallCount, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(true, -1, 4096)]
        [InlineData(true, 0, 4096)]
        [InlineData(true, 1, 4096)]
        [InlineData(true, 14, 4096)]
        [InlineData(false, -1, 0)]
        [InlineData(false, 0, 4096)]
        [InlineData(false, 1, 8192)]
        [InlineData(false, 14, 61440)]
        public void TreeNode_StateImageIndex_GetColumnWithoutImageList_Success(bool checkBoxes, int value, int expected)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal((TVIS)expected, item.state);
        }

        [WinFormsTheory]
        [InlineData(-1, 0)]
        [InlineData(0, 4096)]
        [InlineData(1, 8192)]
        [InlineData(2, 12288)]
        [InlineData(14, 61440)]
        public void TreeNode_StateImageIndex_GetColumnWithEmptyImageList_Success(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal((TVIS)expected, item.state);
        }

        [WinFormsTheory]
        [InlineData(-1, 0)]
        [InlineData(0, 4096)]
        [InlineData(1, 8192)]
        [InlineData(2, 12288)]
        [InlineData(14, 61440)]
        public void TreeNode_StateImageIndex_GetColumnWithImageList_Success(int value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add(image1);
            imageList.Images.Add(image2);
            using var control = new TreeView
            {
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageIndex = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal((TVIS)expected, item.state);
        }

        [WinFormsTheory]
        [InlineData(true, -1, -1)]
        [InlineData(true, 0, 0)]
        [InlineData(true, 1, 0)]
        [InlineData(true, 14, 0)]
        [InlineData(false, -1, -1)]
        [InlineData(false, 0, 0)]
        [InlineData(false, 1, 0)]
        [InlineData(false, 14, 0)]
        public void TreeNode_StateImageIndex_SetWithTreeViewDisposed_GetReturnsExpected(bool checkBoxes, int value, int expectedWithImage)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.StateImageIndex = value;
            Assert.Equal(value, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Add to image list.
            using var image = new Bitmap(10, 10);
            imageList.Images.Add(image);
            Assert.Equal(expectedWithImage, node.StateImageIndex);
            Assert.Empty(node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [InlineData(-2)]
        [InlineData(15)]
        public void TreeNode_StateImageIndex_SetInvalid_ThrowsArgumentOutOfRangeException(int value)
        {
            var node = new TreeNode();
            Assert.Throws<ArgumentOutOfRangeException>("value", () => node.StateImageIndex = value);
        }

        [WinFormsFact]
        public void TreeNode_StateImageIndex_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.StateImageIndex = 0;
            Assert.Equal(0, node.StateImageIndex);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(-1, node.StateImageIndex);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_StateImageKey_SetWithoutTreeView_GetReturnsExpected(string value, string expected)
        {
            var node = new TreeNode
            {
                StateImageKey = value
            };
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
        }

        [WinFormsTheory]
        [InlineData(null, "")]
        [InlineData("", "")]
        [InlineData("StateImageKey", "StateImageKey")]
        public void TreeNode_StateImageKey_SetWithStateImageIndex_GetReturnsExpected(string value, string expectedStateImageKey)
        {
            var node = new TreeNode
            {
                StateImageIndex = 0,
                StateImageKey = value
            };
            Assert.Equal(expectedStateImageKey, node.StateImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.StateImageIndex);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expectedStateImageKey, node.StateImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.StateImageIndex);

            // Set tree view.
            using var control = new TreeView();
            control.Nodes.Add(node);
            Assert.Equal(expectedStateImageKey, node.StateImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.StateImageIndex);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(expectedStateImageKey, node.StateImageKey);
            Assert.Equal(ImageList.Indexer.DefaultIndex, node.StateImageIndex);
        }

        public static IEnumerable<object[]> StateImageKey_SetWithTreeView_TestData()
        {
            foreach (bool checkBoxes in new bool[] { true, false })
            {
                yield return new object[] { checkBoxes, null, string.Empty };
                yield return new object[] { checkBoxes, string.Empty, string.Empty };
                yield return new object[] { checkBoxes, "text", "text" };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageKey_SetWithTreeView_TestData))]
        public void TreeNode_StateImageKey_SetWithTreeView_GetReturnsExpected(bool checkBoxes, string value, string expected)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);

            // Add image list.
            using var imageList = new ImageList();
            control.StateImageList = imageList;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageKey_SetWithTreeView_TestData))]
        public void TreeNode_StateImageKey_SetWithTreeViewWithEmptyList_GetReturnsExpected(bool checkBoxes, string value, string expected)
        {
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        public static IEnumerable<object[]> StateImageKey_SetWithTreeViewWithImageList_TestData()
        {
            foreach (bool checkBoxes in new bool[] { true, false })
            {
                yield return new object[] { checkBoxes, null, "" };
                yield return new object[] { checkBoxes, "", "" };
                yield return new object[] { checkBoxes, "Image1", "Image1" };
                yield return new object[] { checkBoxes, "image1", "image1" };
                yield return new object[] { checkBoxes, "Image2", "Image2" };
                yield return new object[] { checkBoxes, "NoSuchImage", "NoSuchImage" };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageKey_SetWithTreeViewWithImageList_TestData))]
        public void TreeNode_StateImageKey_SetWithTreeViewWithNotEmptyList_GetReturnsExpected(bool checkBoxes, string value, string expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageKey_SetWithTreeView_TestData))]
        public void TreeNode_StateImageKey_SetWithTreeViewWithHandle_GetReturnsExpected(bool checkBoxes, string value, string expected)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.Equal(-1, node.StateImageIndex);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [InlineData(null)]
        [InlineData("")]
        [InlineData("Image1")]
        [InlineData("image1")]
        [InlineData("Image2")]
        [InlineData("NoSuchImage")]
        public void TreeNode_StateImageKey_GetColumnWithoutImageList_Success(string value)
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal((TVIS)0, column.state);
        }

        [WinFormsTheory]
        [InlineData(true, null, 4096)]
        [InlineData(true, "", 4096)]
        [InlineData(true, "Image1", 4096)]
        [InlineData(true, "image1", 4096)]
        [InlineData(true, "Image2", 4096)]
        [InlineData(true, "NoSuchImage", 4096)]
        [InlineData(false, null, 0)]
        [InlineData(false, "", 0)]
        [InlineData(false, "Image1", 0)]
        [InlineData(false, "image1", 0)]
        [InlineData(false, "Image2", 0)]
        [InlineData(false, "NoSuchImage", 0)]
        public void TreeNode_StateImageKey_GetColumnWithEmptyImageList_Success(bool checkBoxes, string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal((TVIS)expected, column.state);
        }

        [WinFormsTheory]
        [InlineData(true, null, 4096)]
        [InlineData(true, "", 4096)]
        [InlineData(true, "Image1", 4096)]
        [InlineData(true, "image1", 4096)]
        [InlineData(true, "Image2", 4096)]
        [InlineData(true, "NoSuchImage", 4096)]
        [InlineData(false, null, 0)]
        [InlineData(false, "", 0)]
        [InlineData(false, "Image1", 4096)]
        [InlineData(false, "image1", 4096)]
        [InlineData(false, "Image2", 8192)]
        [InlineData(false, "NoSuchImage", 0)]
        public void TreeNode_StateImageKey_GetColumnWithImageList_Success(bool checkBoxes, string value, int expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var imageList = new ImageList();
            imageList.Images.Add("Image1", image1);
            imageList.Images.Add("Image2", image2);
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes,
                StateImageList = imageList
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.StateImageKey = value;
            var column = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.STATE,
                stateMask = TVIS.STATEIMAGEMASK,
                hItem = node.Handle
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref column));
            Assert.Equal((TVIS)expected, column.state);
        }

        [WinFormsTheory]
        [MemberData(nameof(StateImageKey_SetWithTreeView_TestData))]
        public void TreeNode_StateImageKey_SetWithTreeViewDisposed_GetReturnsExpected(bool checkBoxes, string value, string expected)
        {
            using var control = new TreeView
            {
                CheckBoxes = checkBoxes
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.StateImageKey = value;
            Assert.Equal(expected, node.StateImageKey);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_StateImageKey_SetInvalidSetItem_ThrowsInvalidOperationException()
        {
            using var control = new InvalidSetItemTreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);

            control.MakeInvalid = true;
            node.StateImageKey = "Key";
            Assert.Equal("Key", node.StateImageKey);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringWithNullTheoryData))]
        public void TreeNode_Tag_Set_GetReturnsExpected(string value)
        {
            var node = new TreeNode
            {
                Tag = value
            };
            Assert.Same(value, node.Tag);

            // Set same.
            node.Tag = value;
            Assert.Same(value, node.Tag);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringNormalizedTheoryData))]
        public void TreeNode_Text_Set_GetReturnsExpected(string value, string expected)
        {
            var node = new TreeNode
            {
                Text = value
            };
            Assert.Equal(expected, node.Text);

            // Set same.
            node.Text = value;
            Assert.Equal(expected, node.Text);
        }

        public static IEnumerable<object[]> Text_SetWithTreeView_TestData()
        {
            foreach (bool scrollable in new bool[] { true, false })
            {
                yield return new object[] { scrollable, null, string.Empty };
                yield return new object[] { scrollable, string.Empty, string.Empty };
                yield return new object[] { scrollable, "text", "text" };
            }
        }

        [WinFormsTheory]
        [MemberData(nameof(Text_SetWithTreeView_TestData))]
        public void TreeNode_Text_SetWithTreeView_GetReturnsExpected(bool scrollable, string value, string expected)
        {
            using var control = new TreeView
            {
                Scrollable = scrollable
            };
            var node = new TreeNode();
            control.Nodes.Add(node);

            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.False(control.IsHandleCreated);

            // Set same.
            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [MemberData(nameof(Text_SetWithTreeView_TestData))]
        public void TreeNode_Text_SetWithTreeViewWithHandle_GetReturnsExpected(bool scrollable, string value, string expected)
        {
            using var control = new TreeView
            {
                Scrollable = scrollable
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);

            // Set same.
            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsTheory]
        [MemberData(nameof(Text_SetWithTreeView_TestData))]
        public unsafe void TreeNode_Text_GetItem_Success(bool scrollable, string value, string expected)
        {
            using var image1 = new Bitmap(10, 10);
            using var image2 = new Bitmap(10, 10);
            using var control = new TreeView
            {
                Scrollable = scrollable
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            char* textBuffer = stackalloc char[256];

            Assert.NotEqual(IntPtr.Zero, control.Handle);
            node.Text = value;
            var item = new TVITEMW
            {
                mask = TVIF.HANDLE | TVIF.TEXT,
                hItem = node.Handle,
                cchTextMax = 256,
                pszText = (IntPtr)textBuffer
            };
            Assert.Equal((IntPtr)1, SendMessageW(control.Handle, (WM)TVM.GETITEMW, (IntPtr)0, ref item));
            Assert.Equal(expected, new string((char*)item.pszText));
        }

        [WinFormsTheory]
        [MemberData(nameof(Text_SetWithTreeView_TestData))]
        public void TreeNode_Text_SetWithTreeViewDisposed_GetReturnsExpected(bool scrollable, string value, string expected)
        {
            using var control = new TreeView
            {
                Scrollable = scrollable
            };
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            control.Dispose();

            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.False(control.IsHandleCreated);

            // Set same
            node.Text = value;
            Assert.Equal(expected, node.Text);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsTheory]
        [CommonMemberData(nameof(CommonTestHelper.GetStringWithNullTheoryData))]
        public void TreeNode_ToolTipText_Set_GetReturnsExpected(string value)
        {
            var node = new TreeNode
            {
                ToolTipText = value
            };
            Assert.Same(value, node.ToolTipText);

            // Set same.
            node.ToolTipText = value;
            Assert.Same(value, node.ToolTipText);
        }

        [WinFormsFact]
        public void TreeNode_TreeView_GetWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);

            Assert.Same(control, node.TreeView);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeNode_TreeView_GetWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var node = new TreeNode();
            control.Nodes.Add(node);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Same(control, node.TreeView);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        [WinFormsFact]
        public void TreeView_TreeView_GetWithTreeView_ReturnsExpected()
        {
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.Null(node1.TreeView);
            Assert.Null(node2.TreeView);
            Assert.Null(node3.TreeView);
            Assert.Null(node4.TreeView);
        }

        [WinFormsFact]
        public void TreeView_TreeView_GetWithTreeViewWithTreeView_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);

            Assert.Same(control, node1.TreeView);
            Assert.Same(control, node2.TreeView);
            Assert.Same(control, node3.TreeView);
            Assert.Same(control, node4.TreeView);
            Assert.False(control.IsHandleCreated);
        }

        [WinFormsFact]
        public void TreeView_TreeView_GetWithTreeViewWithTreeViewWithHandle_ReturnsExpected()
        {
            using var control = new TreeView();
            var parent = new TreeNode();
            var node1 = new TreeNode();
            var node2 = new TreeNode();
            var node3 = new TreeNode();
            var node4 = new TreeNode();
            control.Nodes.Add(parent);
            parent.Nodes.Add(node1);
            parent.Nodes.Add(node2);
            parent.Nodes.Add(node3);
            node3.Nodes.Add(node4);
            Assert.NotEqual(IntPtr.Zero, control.Handle);
            int invalidatedCallCount = 0;
            control.Invalidated += (sender, e) => invalidatedCallCount++;
            int styleChangedCallCount = 0;
            control.StyleChanged += (sender, e) => styleChangedCallCount++;
            int createdCallCount = 0;
            control.HandleCreated += (sender, e) => createdCallCount++;

            Assert.Same(control, node1.TreeView);
            Assert.Same(control, node2.TreeView);
            Assert.Same(control, node3.TreeView);
            Assert.Same(control, node4.TreeView);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
        }

        private class InvalidSetItemTreeView : TreeView
        {
            public bool MakeInvalid { get; set; }

            protected override void WndProc(ref Message m)
            {
                if (MakeInvalid && m.Msg == (int)TVM.SETITEMW)
                {
                    m.Result = IntPtr.Zero;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        private class CustomGetItemTreeView : TreeView
        {
            public TVIS GetItemStateResult { get; set; }

            protected unsafe override void WndProc(ref Message m)
            {
                if (m.Msg == (int)TVM.GETITEMW)
                {
                    TVITEMW* pItem = (TVITEMW*)m.LParam;
                    pItem->state = GetItemStateResult;
                    Assert.Equal(IntPtr.Zero, m.WParam);
                    m.Result = (IntPtr)1;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        private class InvalidGetItemTreeView : TreeView
        {
            public bool MakeInvalid { get; set; }

            public TVIS GetItemStateResult { get; set; }

            protected unsafe override void WndProc(ref Message m)
            {
                if (MakeInvalid && m.Msg == (int)TVM.GETITEMW)
                {
                    TVITEMW* pItem = (TVITEMW*)m.LParam;
                    pItem->state = GetItemStateResult;
                    Assert.Equal(IntPtr.Zero, m.WParam);
                    m.Result = (IntPtr)0;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        private class CustomGetItemRectTreeView : TreeView
        {
            public RECT GetItemRectResult { get; set; }

            protected unsafe override void WndProc(ref Message m)
            {
                if (m.Msg == (int)TVM.GETITEMRECT)
                {
                    RECT* pRect = (RECT*)m.LParam;
                    *pRect = GetItemRectResult;
                    Assert.Equal((IntPtr)1, m.WParam);
                    m.Result = (IntPtr)1;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        private class InvalidGetItemRectTreeView : TreeView
        {
            public bool MakeInvalid { get; set; }

            protected unsafe override void WndProc(ref Message m)
            {
                if (MakeInvalid && m.Msg == (int)TVM.GETITEMRECT)
                {
                    RECT* pRect = (RECT*)m.LParam;
                    *pRect = new RECT(1, 2, 3, 4);
                    m.Result = IntPtr.Zero;
                    return;
                }

                base.WndProc(ref m);
            }
        }

        private class SubTreeNode : TreeNode
        {
            public SubTreeNode(SerializationInfo serializationInfo, StreamingContext context) : base(serializationInfo, context)
            {
            }

            public new void Deserialize(SerializationInfo serializationInfo, StreamingContext context) => base.Deserialize(serializationInfo, context);
        }
    }
}
