require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "1.8.7" do
  describe "Range#min" do
    it "returns the minimum value in the range when called with no arguments" do
      (1..10).min.should == 1
      ('f'..'l').min.should == 'f'
    end

    ruby_version_is "1.9" do
      it "returns the minimum value in the Float range when called with no arguments" do
        (303.20..908.1111).min.should == 303.20
      end
    end

    ruby_version_is ""..."1.9" do
      it "raises TypeError when called on a Float range" do
        lambda { (303.20..908.1111).min }.should raise_error(TypeError)
      end
    end

    it "returns nil when the start point is greater than the endpoint" do
      (100..10).min.should be_nil
      ('z'..'l').min.should be_nil
      (7...7).min.should be_nil
    end

    ruby_version_is "1.9" do
      it "returns nil when the start point is greater than the endpoint in a Float range" do
        (3003.20..908.1111).min.should be_nil
      end
    end
  end

  describe "Range#min given a block" do
    it "passes each pair of values in the range to the block" do
      acc = []
      (1..10).min {|a,b| acc << [a,b]; a }
      acc.flatten!
      (1..10).each do |value|
        acc.include?(value).should be_true
      end
    end

    it "passes each pair of elements to the block where the first argument is the current element, and the last is the first element" do
      acc = []
      (1..5).min {|a,b| acc << [a,b]; a }
      acc.should == [[2, 1], [3, 1], [4, 1], [5, 1]]
    end

    it "calls #> and #< on the return value of the block" do
      obj = mock('obj')
      obj.should_receive(:>).exactly(2).times
      obj.should_receive(:<).exactly(2).times
      (1..3).min {|a,b| obj }
    end

    it "returns the element the block determines to be the minimum" do
      (1..3).min {|a,b| -3 }.should == 3
    end

    it "returns nil when the start point is greater than the endpoint" do
      (100..10).min {|x,y| x <=> y}.should be_nil
      ('z'..'l').min {|x,y| x <=> y}.should be_nil
      (7...7).min {|x,y| x <=> y}.should be_nil
    end
  end
end
