diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 00000000..16e7c18c
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,3 @@
+test/snapshots/*
+package*.json
+CHANGELOG.md
diff --git a/ava.config.js b/ava.config.js
new file mode 100644
index 00000000..15951484
--- /dev/null
+++ b/ava.config.js
@@ -0,0 +1,3 @@
+export default {
+  files: ['test/**/*.test.js']
+}
diff --git a/package-lock.json b/package-lock.json
index 2ca18ea5..d9f049a3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,11 +4,481 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+      "dev": true
+    },
+    "@ava/babel-preset-stage-4": {
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+      "resolved": "https://registry.npmjs.org/@ava/babel-preset-stage-4/-/babel-preset-stage-4-2.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
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+        "@babel/plugin-transform-dotall-regex": "^7.0.0",
+        "@babel/plugin-transform-exponentiation-operator": "^7.0.0",
+        "@babel/plugin-transform-modules-commonjs": "^7.0.0"
+      }
+    },
+    "@ava/babel-preset-transform-test-files": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-4.0.1.tgz",
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+      "dev": true,
+      "requires": {
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+        "babel-plugin-espower": "^3.0.1"
+      }
+    },
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+        "@babel/helpers": "^7.2.0",
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+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ==",
+      "dev": true
+    },
+    "unicode-match-property-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg==",
+      "dev": true,
+      "requires": {
+        "unicode-canonical-property-names-ecmascript": "^1.0.4",
+        "unicode-property-aliases-ecmascript": "^1.0.4"
+      }
+    },
+    "unicode-match-property-value-ecmascript": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.0.2.tgz",
+      "integrity": "sha512-Rx7yODZC1L/T8XKo/2kNzVAQaRE88AaMvI1EF/Xnj3GW2wzN6fop9DDWuFAKUVFH7vozkz26DzP0qyWLKLIVPQ==",
+      "dev": true
+    },
+    "unicode-property-aliases-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-2WSLa6OdYd2ng8oqiGIWnJqyFArvhn+5vgx5GTxMbUYjCYKUcuKS62YLFF0R/BDGlB1yzXjQOLtPAfHsgirEpg==",
+      "dev": true
+    },
+    "union-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
+      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "dev": true,
+      "requires": {
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^0.4.3"
+      },
+      "dependencies": {
+        "extend-shallow": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+          "dev": true,
+          "requires": {
+            "is-extendable": "^0.1.0"
+          }
+        },
+        "set-value": {
+          "version": "0.4.3",
+          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
+          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
+          "dev": true,
+          "requires": {
+            "extend-shallow": "^2.0.1",
+            "is-extendable": "^0.1.1",
+            "is-plain-object": "^2.0.1",
+            "to-object-path": "^0.3.0"
+          }
+        }
+      }
+    },
     "uniq": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
       "integrity": "sha1-sxxa6CVIRKOoKBVBzisEuGWnNP8=",
       "dev": true
     },
+    "unique-string": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
+      "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
+      "dev": true,
+      "requires": {
+        "crypto-random-string": "^1.0.0"
+      }
+    },
+    "unique-temp-dir": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unique-temp-dir/-/unique-temp-dir-1.0.0.tgz",
+      "integrity": "sha1-bc6VsmgcoAPuv7MEpBX5y6vMU4U=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1",
+        "os-tmpdir": "^1.0.1",
+        "uid2": "0.0.3"
+      }
+    },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
+      },
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        }
+      }
+    },
+    "unzip-response": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/unzip-response/-/unzip-response-2.0.1.tgz",
+      "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=",
+      "dev": true
+    },
+    "upath": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.0.tgz",
+      "integrity": "sha512-bzpH/oBhoS/QI/YtbkqCg6VEiPYjSZtrHQM6/QnJS6OL9pKUFLqb3aFh4Scvwm45+7iAgiMkLhSbaZxUqmrprw==",
+      "dev": true
+    },
+    "update-notifier": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-2.5.0.tgz",
+      "integrity": "sha512-gwMdhgJHGuj/+wHJJs9e6PcCszpxR1b236igrOkUofGhqJuG+amlIKwApH1IW1WWl7ovZxsX49lMBWLxSdm5Dw==",
+      "dev": true,
+      "requires": {
+        "boxen": "^1.2.1",
+        "chalk": "^2.0.1",
+        "configstore": "^3.0.0",
+        "import-lazy": "^2.1.0",
+        "is-ci": "^1.0.10",
+        "is-installed-globally": "^0.1.0",
+        "is-npm": "^1.0.0",
+        "latest-version": "^3.0.0",
+        "semver-diff": "^2.0.0",
+        "xdg-basedir": "^3.0.0"
+      },
+      "dependencies": {
+        "ci-info": {
+          "version": "1.6.0",
+          "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.6.0.tgz",
+          "integrity": "sha512-vsGdkwSCDpWmP80ncATX7iea5DWQemg1UgCW5J8tqjU3lYw4FBYuj89J0CTVomA7BEfvSZd84GmHko+MxFQU2A==",
+          "dev": true
+        },
+        "is-ci": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-1.2.1.tgz",
+          "integrity": "sha512-s6tfsaQaQi3JNciBH6shVqEDvhGut0SUXr31ag8Pd8BBbVVlcGfWhpPmEOoM6RJ5TFhbypvf5yyRw/VXW1IiWg==",
+          "dev": true,
+          "requires": {
+            "ci-info": "^1.5.0"
+          }
+        }
+      }
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -4204,6 +7806,27 @@
         "punycode": "^2.1.0"
       }
     },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "url-parse-lax": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
+      "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^1.0.1"
+      }
+    },
+    "use": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+      "dev": true
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -4240,6 +7863,21 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "wcwidth": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
+      "integrity": "sha1-8LDc+RW8X/FSivrbLA4XtTLaL+g=",
+      "dev": true,
+      "requires": {
+        "defaults": "^1.0.3"
+      }
+    },
+    "well-known-symbols": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-2.0.0.tgz",
+      "integrity": "sha512-ZMjC3ho+KXo0BfJb7JgtQ5IBuvnShdlACNkKkdsqBmYw3bPAaJfPeYUo6tLUaT5tG/Gkh7xkpBhKRQ9e7pyg9Q==",
+      "dev": true
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
@@ -4253,6 +7891,15 @@
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
+    "widest-line": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
+      "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^2.1.1"
+      }
+    },
     "window-size": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -4299,6 +7946,23 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "xdg-basedir": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index 110056b2..abfbd7e0 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,8 @@
     "url": "git@github.com:bcoe/c8.git"
   },
   "scripts": {
-    "test": "node ./bin/c8.js --reporter=html --reporter=text mocha --timeout=4000 ./test/*.js",
-    "test:snap": "CHAI_JEST_SNAPSHOT_UPDATE_ALL=true npm test",
+    "test": "node ./bin/c8.js --include lib --reporter=html --reporter=text ava",
+    "test:snap": "ava -u",
     "posttest": "standard",
     "coverage": "./bin/c8.js report --reporter=text-lcov | coveralls",
     "release": "standard-version"
@@ -47,10 +47,10 @@
     "yargs-parser": "^10.1.0"
   },
   "devDependencies": {
-    "chai": "^4.1.2",
-    "chai-jest-snapshot": "^2.0.0",
+    "ava": "^1.2.1",
+    "await-spawn": "^2.1.2",
     "coveralls": "^3.0.2",
-    "mocha": "^5.2.0",
+    "prettier": "^1.16.4",
     "standard": "^12.0.1",
     "standard-version": "^4.4.0"
   },
@@ -61,5 +61,9 @@
     "lib",
     "bin",
     "LICENSE"
-  ]
+  ],
+  "prettier": {
+    "singleQuote": true,
+    "semi": false
+  }
 }
diff --git a/test/check-coverage.test.js b/test/check-coverage.test.js
new file mode 100644
index 00000000..6d081968
--- /dev/null
+++ b/test/check-coverage.test.js
@@ -0,0 +1,56 @@
+import test from 'ava'
+import spawn from 'await-spawn'
+
+const nodePath = process.execPath
+const c8Path = require.resolve('../bin/c8')
+
+test('exits with 0 if coverage within threshold', async t => {
+  const output = await spawn(nodePath, [
+    c8Path,
+    'check-coverage',
+    '--exclude="test/*.js"',
+    '--lines=70'
+  ])
+
+  t.snapshot(output.toString('utf8'))
+})
+
+test('allows threshold to be applied on a per-file basis', t => {
+  return spawn(nodePath, [
+    c8Path,
+    'check-coverage',
+    '--exclude="test/*.js"',
+    '--lines=80',
+    '--per-file'
+  ]).catch(({ code, stderr }) => {
+    t.is(code, 1)
+    t.snapshot(stderr.toString('utf8'))
+  })
+})
+
+test('exits with 1 if coverage is below threshold', t => {
+  return spawn(nodePath, [
+    c8Path,
+    'check-coverage',
+    '--exclude="test/*.js"',
+    '--lines=101'
+  ]).catch(({ code, stderr }) => {
+    t.is(code, 1)
+    t.snapshot(stderr.toString('utf8'))
+  })
+})
+
+test('allows --check-coverage when executing script', t => {
+  return spawn(nodePath, [
+    c8Path,
+    '--exclude="test/*.js"',
+    '--clean=false',
+    '--lines=101',
+    '--check-coverage',
+    nodePath,
+    require.resolve('./fixtures/normal')
+  ]).catch(({ code, stderr }) => {
+    t.is(code, 1)
+    t.snapshot(stderr.toString('utf8'))
+  })
+})
diff --git a/test/integration.js b/test/integration.js
deleted file mode 100644
index a7e314ef..00000000
--- a/test/integration.js
+++ /dev/null
@@ -1,125 +0,0 @@
-/* global describe, beforeEach, it */
-
-const { spawnSync } = require('child_process')
-const c8Path = require.resolve('../bin/c8')
-const nodePath = process.execPath
-const chaiJestSnapshot = require('chai-jest-snapshot')
-
-require('chai')
-  .use(chaiJestSnapshot)
-  .should()
-
-beforeEach(function () { chaiJestSnapshot.configureUsingMochaContext(this) })
-
-describe('c8', () => {
-  it('reports coverage for script that exits normally', () => {
-    const { output } = spawnSync(nodePath, [
-      c8Path,
-      '--exclude="test/*.js"',
-      '--clean=false',
-      nodePath,
-      require.resolve('./fixtures/normal')
-    ])
-    output.toString('utf8').should.matchSnapshot()
-  })
-
-  it('merges reports from subprocesses together', () => {
-    const { output } = spawnSync(nodePath, [
-      c8Path,
-      '--exclude="test/*.js"',
-      '--clean=false',
-      nodePath,
-      require.resolve('./fixtures/multiple-spawn')
-    ])
-    output.toString('utf8').should.matchSnapshot()
-  })
-
-  it('allows relative files to be included', () => {
-    const { output } = spawnSync(nodePath, [
-      c8Path,
-      '--exclude="test/*.js"',
-      '--omit-relative=false',
-      '--clean=false',
-      nodePath,
-      require.resolve('./fixtures/multiple-spawn')
-    ])
-    output.toString('utf8').should.match(
-      /Error: ENOENT: no such file or directory.*loaders\.js/
-    )
-  })
-
-  describe('check-coverage', () => {
-    it('exits with 0 if coverage within threshold', () => {
-      const { output, status } = spawnSync(nodePath, [
-        c8Path,
-        'check-coverage',
-        '--exclude="test/*.js"',
-        '--lines=80'
-      ])
-      status.should.equal(0)
-      output.toString('utf8').should.matchSnapshot()
-    })
-
-    it('allows threshold to be applied on per-file basis', () => {
-      const { output, status } = spawnSync(nodePath, [
-        c8Path,
-        'check-coverage',
-        '--exclude="test/*.js"',
-        '--lines=80',
-        '--per-file'
-      ])
-      status.should.equal(1)
-      output.toString('utf8').should.matchSnapshot()
-    })
-
-    it('exits with 1 if coverage is below threshold', () => {
-      const { output, status } = spawnSync(nodePath, [
-        c8Path,
-        'check-coverage',
-        '--exclude="test/*.js"',
-        '--lines=101'
-      ])
-      status.should.equal(1)
-      output.toString('utf8').should.matchSnapshot()
-    })
-
-    it('allows --check-coverage when executing script', () => {
-      const { output, status } = spawnSync(nodePath, [
-        c8Path,
-        '--exclude="test/*.js"',
-        '--clean=false',
-        '--lines=101',
-        '--check-coverage',
-        nodePath,
-        require.resolve('./fixtures/normal')
-      ])
-      status.should.equal(1)
-      output.toString('utf8').should.matchSnapshot()
-    })
-  })
-
-  describe('report', () => {
-    it('generates report from existing temporary files', () => {
-      const { output } = spawnSync(nodePath, [
-        c8Path,
-        'report',
-        '--exclude="test/*.js"',
-        '--clean=false'
-      ])
-      output.toString('utf8').should.matchSnapshot()
-    })
-
-    it('supports --check-coverage, when generating reports', () => {
-      const { output, status } = spawnSync(nodePath, [
-        c8Path,
-        'report',
-        '--check-coverage',
-        '--lines=101',
-        '--exclude="test/*.js"',
-        '--clean=false'
-      ])
-      status.should.equal(1)
-      output.toString('utf8').should.matchSnapshot()
-    })
-  })
-})
diff --git a/test/integration.js.snap b/test/integration.js.snap
deleted file mode 100644
index 55236f48..00000000
--- a/test/integration.js.snap
+++ /dev/null
@@ -1,135 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`c8 check-coverage allows --check-coverage when executing script 1`] = `
-",hey
-i am a line of code
-what
-hey
-what
-hey
-what
-hey
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    95.46 |    76.83 |    89.66 |    95.46 |                   |
- bin                |    85.71 |    83.33 |      100 |    85.71 |                   |
-  c8.js             |    85.71 |    83.33 |      100 |    85.71 |    25,32,33,34,35 |
- lib                |     97.1 |       65 |      100 |     97.1 |                   |
-  parse-args.js     |    98.41 |    53.85 |      100 |    98.41 |           102,103 |
-  report.js         |       96 |    70.37 |      100 |       96 |... 08,134,135,136 |
- lib/commands       |    97.67 |    84.21 |     87.5 |    97.67 |                   |
-  check-coverage.js |      100 |    92.86 |      100 |      100 |                17 |
-  report.js         |    92.31 |       60 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.91 |    94.12 |       75 |    90.91 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,ERROR: Coverage for lines (95.46%) does not meet global threshold (101%)
-"
-`;
-
-exports[`c8 check-coverage allows threshold to be applied on per-file basis 1`] = `
-",,ERROR: Coverage for lines (78.33%) does not meet threshold (80%) for lib/commands/check-coverage.js
-ERROR: Coverage for lines (76%) does not meet threshold (80%) for test/fixtures/normal.js
-"
-`;
-
-exports[`c8 check-coverage exits with 0 if coverage within threshold 1`] = `",,"`;
-
-exports[`c8 check-coverage exits with 1 if coverage is below threshold 1`] = `
-",,ERROR: Coverage for lines (95.03%) does not meet global threshold (101%)
-"
-`;
-
-exports[`c8 merges reports from subprocesses together 1`] = `
-",first
-
-second
-
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    84.67 |    68.18 |    74.07 |    84.67 |                   |
- bin                |    85.71 |    66.67 |      100 |    85.71 |                   |
-  c8.js             |    85.71 |    66.67 |      100 |    85.71 |    25,32,33,34,35 |
- lib                |    95.65 |    55.56 |      100 |    95.65 |                   |
-  parse-args.js     |    96.83 |    41.67 |      100 |    96.83 |     88,89,102,103 |
-  report.js         |    94.67 |     62.5 |      100 |    94.67 |... 08,134,135,136 |
- lib/commands       |    44.19 |    71.43 |    16.67 |    44.19 |                   |
-  check-coverage.js |    23.33 |      100 |        0 |    23.33 |... 55,56,57,58,59 |
-  report.js         |    92.31 |       60 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.91 |    94.12 |       75 |    90.91 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,"
-`;
-
-exports[`c8 report generates report from existing temporary files 1`] = `
-",--------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    95.46 |    79.76 |    89.66 |    95.46 |                   |
- bin                |    85.71 |    85.71 |      100 |    85.71 |                   |
-  c8.js             |    85.71 |    85.71 |      100 |    85.71 |    25,32,33,34,35 |
- lib                |     97.1 |    69.05 |      100 |     97.1 |                   |
-  parse-args.js     |    98.41 |    53.85 |      100 |    98.41 |           102,103 |
-  report.js         |       96 |    75.86 |      100 |       96 |... 08,134,135,136 |
- lib/commands       |    97.67 |    88.89 |     87.5 |    97.67 |                   |
-  check-coverage.js |      100 |    92.31 |      100 |      100 |                17 |
-  report.js         |    92.31 |       80 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.91 |    94.12 |       75 |    90.91 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,"
-`;
-
-exports[`c8 report supports --check-coverage, when generating reports 1`] = `
-",--------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |     95.9 |    79.76 |     93.1 |     95.9 |                   |
- bin                |    85.71 |    83.33 |      100 |    85.71 |                   |
-  c8.js             |    85.71 |    83.33 |      100 |    85.71 |    25,32,33,34,35 |
- lib                |     97.1 |    69.05 |      100 |     97.1 |                   |
-  parse-args.js     |    98.41 |    53.85 |      100 |    98.41 |           102,103 |
-  report.js         |       96 |    75.86 |      100 |       96 |... 08,134,135,136 |
- lib/commands       |      100 |    89.47 |      100 |      100 |                   |
-  check-coverage.js |      100 |    92.31 |      100 |      100 |                17 |
-  report.js         |      100 |    83.33 |      100 |      100 |                16 |
- test/fixtures      |    90.91 |    94.12 |       75 |    90.91 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,ERROR: Coverage for lines (95.9%) does not meet global threshold (101%)
-"
-`;
-
-exports[`c8 reports coverage for script that exits normally 1`] = `
-",hey
-i am a line of code
-what
-hey
-what
-hey
-what
-hey
------------|----------|----------|----------|----------|-------------------|
-File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
------------|----------|----------|----------|----------|-------------------|
-All files  |    84.21 |    88.89 |    66.67 |    84.21 |                   |
- async.js  |      100 |      100 |      100 |      100 |                   |
- normal.js |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |
------------|----------|----------|----------|----------|-------------------|
-,"
-`;
diff --git a/test/integration.test.js b/test/integration.test.js
new file mode 100644
index 00000000..f74e778d
--- /dev/null
+++ b/test/integration.test.js
@@ -0,0 +1,45 @@
+import test from 'ava'
+import spawn from 'await-spawn'
+
+const nodePath = process.execPath
+const c8Path = require.resolve('../bin/c8')
+
+test('reports coverage for script that exits normally', async t => {
+  const output = await spawn(nodePath, [
+    c8Path,
+    '--exclude="test/*.js"',
+    '--clean=false',
+    nodePath,
+    require.resolve('./fixtures/normal')
+  ])
+
+  t.snapshot(output.toString('utf8'))
+})
+
+test('merges reports from suprocess together', async t => {
+  const output = await spawn(nodePath, [
+    c8Path,
+    '--exclude="test/*.js"',
+    '--clean=false',
+    nodePath,
+    require.resolve('./fixtures/multiple-spawn')
+  ])
+
+  t.snapshot(output.toString('utf8'))
+})
+
+test.failing('allows relative files to be included', async t => {
+  const output = await spawn(nodePath, [
+    c8Path,
+    '--exclude="test/*.js"',
+    '--omit-relative=false',
+    '--clean=false',
+    nodePath,
+    require.resolve('./fixtures/multiple-spawn')
+  ])
+
+  t.regex(
+    output.toString('utf8'),
+    /Error: ENOENT: no such file or directory.*loaders\.js/
+  )
+})
diff --git a/test/parse-args.js b/test/parse-args.js
deleted file mode 100644
index 04f29194..00000000
--- a/test/parse-args.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/* global describe, it */
-
-const {
-  buildYargs,
-  hideInstrumenteeArgs,
-  hideInstrumenterArgs
-} = require('../lib/parse-args')
-
-describe('parse-args', () => {
-  describe('hideInstrumenteeArgs', () => {
-    it('hides arguments passed to instrumented app', () => {
-      process.argv = ['node', 'c8', '--foo=99', 'my-app', '--help']
-      const instrumenterArgs = hideInstrumenteeArgs()
-      instrumenterArgs.should.eql(['--foo=99', 'my-app'])
-    })
-  })
-
-  describe('hideInstrumenterArgs', () => {
-    it('hides arguments passed to c8 bin', () => {
-      process.argv = ['node', 'c8', '--foo=99', 'my-app', '--help']
-      const argv = buildYargs().parse(hideInstrumenteeArgs())
-      const instrumenteeArgs = hideInstrumenterArgs(argv)
-      instrumenteeArgs.should.eql(['my-app', '--help'])
-    })
-  })
-})
diff --git a/test/parse-args.test.js b/test/parse-args.test.js
new file mode 100644
index 00000000..2aee4679
--- /dev/null
+++ b/test/parse-args.test.js
@@ -0,0 +1,23 @@
+import test from 'ava'
+import {
+  buildYargs,
+  hideInstrumenteeArgs,
+  hideInstrumenterArgs
+} from '../lib/parse-args'
+
+test('hideInstrumentee args hides arguments passed to instrumented app', t => {
+  process.argv = ['node', 'c8', '--foo=99', 'my-app', '--help']
+
+  const instrumenterArgs = hideInstrumenteeArgs()
+
+  t.deepEqual(instrumenterArgs, ['--foo=99', 'my-app'])
+})
+
+test('hideInstrumenterArgs hides arguments passed to c8 bin', t => {
+  process.argv = ['node', 'c8', '--foo=99', 'my-app', '--help']
+  const argv = buildYargs().parse(hideInstrumenteeArgs())
+
+  const instrumenteeArgs = hideInstrumenterArgs(argv)
+
+  t.deepEqual(instrumenteeArgs, ['my-app', '--help'])
+})
diff --git a/test/report.test.js b/test/report.test.js
new file mode 100644
index 00000000..e2053f3c
--- /dev/null
+++ b/test/report.test.js
@@ -0,0 +1,30 @@
+import test from 'ava'
+import spawn from 'await-spawn'
+
+const nodePath = process.execPath
+const c8Path = require.resolve('../bin/c8')
+
+test('generates report from existing temporary files', async t => {
+  const output = await spawn(nodePath, [
+    c8Path,
+    'report',
+    '--exclude="test/*.js"',
+    '--clean=false'
+  ])
+
+  t.snapshot(output.toString('utf8'))
+})
+
+test('supports --check-coverage when generating reports', t => {
+  return spawn(nodePath, [
+    c8Path,
+    'report',
+    '--check-coverage',
+    '--lines=101',
+    '--exclude="test/*.js"',
+    '--clean=false'
+  ]).catch(({ code, stderr }) => {
+    t.is(code, 1)
+    t.snapshot(stderr.toString('utf8'))
+  })
+})
diff --git a/test/snapshots/check-coverage.test.js.md b/test/snapshots/check-coverage.test.js.md
new file mode 100644
index 00000000..f0a83057
--- /dev/null
+++ b/test/snapshots/check-coverage.test.js.md
@@ -0,0 +1,32 @@
+# Snapshot report for `test/check-coverage.test.js`
+
+The actual snapshot is saved in `check-coverage.test.js.snap`.
+
+Generated by [AVA](https://ava.li).
+
+## allows --check-coverage when executing script
+
+> Snapshot 1
+
+    `ERROR: Coverage for lines (95.07%) does not meet global threshold (101%)␊
+    `
+
+## allows threshold to be applied on a per-file basis
+
+> Snapshot 1
+
+    `ERROR: Coverage for lines (76%) does not meet threshold (80%) for test/fixtures/normal.js␊
+    `
+
+## exits with 0 if coverage within threshold
+
+> Snapshot 1
+
+    ''
+
+## exits with 1 if coverage is below threshold
+
+> Snapshot 1
+
+    `ERROR: Coverage for lines (95.07%) does not meet global threshold (101%)␊
+    `
diff --git a/test/snapshots/check-coverage.test.js.snap b/test/snapshots/check-coverage.test.js.snap
new file mode 100644
index 00000000..e43a8570
Binary files /dev/null and b/test/snapshots/check-coverage.test.js.snap differ
diff --git a/test/snapshots/integration.test.js.md b/test/snapshots/integration.test.js.md
new file mode 100644
index 00000000..0c132bb3
--- /dev/null
+++ b/test/snapshots/integration.test.js.md
@@ -0,0 +1,69 @@
+# Snapshot report for `test/integration.test.js`
+
+The actual snapshot is saved in `integration.test.js.snap`.
+
+Generated by [AVA](https://ava.li).
+
+## merges reports from suprocess together
+
+> Snapshot 1
+
+    `first␊
+    ␊
+    second␊
+    ␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    All files           |    95.07 |     85.9 |    89.66 |    95.07 |                   |␊
+     c8                 |      100 |      100 |      100 |      100 |                   |␊
+      ava.config.js     |      100 |      100 |      100 |      100 |                   |␊
+     c8/bin             |    85.71 |    85.71 |      100 |    85.71 |                   |␊
+      c8.js             |    85.71 |    85.71 |      100 |    85.71 |    25,32,33,34,35 |␊
+     c8/lib             |    97.46 |    83.33 |      100 |    97.46 |                   |␊
+      parse-args.js     |    98.41 |    63.64 |      100 |    98.41 |           102,103 |␊
+      report.js         |    96.67 |       92 |      100 |    96.67 |... 08,134,135,136 |␊
+     c8/lib/commands    |    94.19 |    83.33 |     87.5 |    94.19 |                   |␊
+      check-coverage.js |    91.67 |    83.33 |    83.33 |    91.67 |    37,50,51,52,53 |␊
+      report.js         |      100 |    83.33 |      100 |      100 |                16 |␊
+     c8/test/fixtures   |    90.91 |    94.12 |       75 |    90.91 |                   |␊
+      async.js          |      100 |      100 |      100 |      100 |                   |␊
+      multiple-spawn.js |      100 |      100 |      100 |      100 |                   |␊
+      normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |␊
+      subprocess.js     |      100 |      100 |      100 |      100 |                   |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    `
+
+## reports coverage for script that exits normally
+
+> Snapshot 1
+
+    `hey␊
+    i am a line of code␊
+    what␊
+    hey␊
+    what␊
+    hey␊
+    what␊
+    hey␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    All files           |    95.07 |     85.9 |    89.66 |    95.07 |                   |␊
+     c8                 |      100 |      100 |      100 |      100 |                   |␊
+      ava.config.js     |      100 |      100 |      100 |      100 |                   |␊
+     c8/bin             |    85.71 |    85.71 |      100 |    85.71 |                   |␊
+      c8.js             |    85.71 |    85.71 |      100 |    85.71 |    25,32,33,34,35 |␊
+     c8/lib             |    97.46 |    83.33 |      100 |    97.46 |                   |␊
+      parse-args.js     |    98.41 |    63.64 |      100 |    98.41 |           102,103 |␊
+      report.js         |    96.67 |       92 |      100 |    96.67 |... 08,134,135,136 |␊
+     c8/lib/commands    |    94.19 |    83.33 |     87.5 |    94.19 |                   |␊
+      check-coverage.js |    91.67 |    83.33 |    83.33 |    91.67 |    37,50,51,52,53 |␊
+      report.js         |      100 |    83.33 |      100 |      100 |                16 |␊
+     c8/test/fixtures   |    90.91 |    94.12 |       75 |    90.91 |                   |␊
+      async.js          |      100 |      100 |      100 |      100 |                   |␊
+      multiple-spawn.js |      100 |      100 |      100 |      100 |                   |␊
+      normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |␊
+      subprocess.js     |      100 |      100 |      100 |      100 |                   |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    `
diff --git a/test/snapshots/integration.test.js.snap b/test/snapshots/integration.test.js.snap
new file mode 100644
index 00000000..6ae1aad9
Binary files /dev/null and b/test/snapshots/integration.test.js.snap differ
diff --git a/test/snapshots/report.test.js.md b/test/snapshots/report.test.js.md
new file mode 100644
index 00000000..72bc26b5
--- /dev/null
+++ b/test/snapshots/report.test.js.md
@@ -0,0 +1,38 @@
+# Snapshot report for `test/report.test.js`
+
+The actual snapshot is saved in `report.test.js.snap`.
+
+Generated by [AVA](https://ava.li).
+
+## generates report from existing temporary files
+
+> Snapshot 1
+
+    `--------------------|----------|----------|----------|----------|-------------------|␊
+    File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    All files           |    95.07 |     85.9 |    89.66 |    95.07 |                   |␊
+     c8                 |      100 |      100 |      100 |      100 |                   |␊
+      ava.config.js     |      100 |      100 |      100 |      100 |                   |␊
+     c8/bin             |    85.71 |    85.71 |      100 |    85.71 |                   |␊
+      c8.js             |    85.71 |    85.71 |      100 |    85.71 |    25,32,33,34,35 |␊
+     c8/lib             |    97.46 |    83.33 |      100 |    97.46 |                   |␊
+      parse-args.js     |    98.41 |    63.64 |      100 |    98.41 |           102,103 |␊
+      report.js         |    96.67 |       92 |      100 |    96.67 |... 08,134,135,136 |␊
+     c8/lib/commands    |    94.19 |    83.33 |     87.5 |    94.19 |                   |␊
+      check-coverage.js |    91.67 |    83.33 |    83.33 |    91.67 |    37,50,51,52,53 |␊
+      report.js         |      100 |    83.33 |      100 |      100 |                16 |␊
+     c8/test/fixtures   |    90.91 |    94.12 |       75 |    90.91 |                   |␊
+      async.js          |      100 |      100 |      100 |      100 |                   |␊
+      multiple-spawn.js |      100 |      100 |      100 |      100 |                   |␊
+      normal.js         |       76 |       75 |    33.33 |       76 | 14,15,16,18,19,20 |␊
+      subprocess.js     |      100 |      100 |      100 |      100 |                   |␊
+    --------------------|----------|----------|----------|----------|-------------------|␊
+    `
+
+## supports --check-coverage when generating reports
+
+> Snapshot 1
+
+    `ERROR: Coverage for lines (95.07%) does not meet global threshold (101%)␊
+    `
diff --git a/test/snapshots/report.test.js.snap b/test/snapshots/report.test.js.snap
new file mode 100644
index 00000000..f7558551
Binary files /dev/null and b/test/snapshots/report.test.js.snap differ