CHANGELOG.md

master

Fixes

• [jest-cli] Check if npm_lifecycle_script calls Jest directly (#4629)
• [jest-cli] Fix --showConfig to show all configs (#4494)
• [jest-cli] Throw if maxWorkers doesn't have a value (#4591)
• [jest-config] Fix --passWithNoTests (#4639)
• [jest-config] Support rootDir tag in testEnvironment (#4579)
• [jest-editor-support] Fix --showConfig to support jest 20 and jest 21 (#4575)
• [jest-editor-support] Fix editor support test for node 4 (#4640)
• [jest-mock] Support mocking constructor in mockImplementationOnce (#4599)
• [jest-runtime] Fix manual user mocks not working with custom resolver (#4489)
• [jest-runtime] Move babel-core to peer dependencies so it works with Babel 7 (#4557)
• [jest-util] Fix runOnlyPendingTimers for setTimeout inside setImmediate (#4608)
• [jest-message-util] Always remove node internals from stacktraces (#4695)
• [jest-resolve] changes method of determining builtin modules to include missing builtins (#4740)
• [pretty-format] Prevent error in pretty-format for window in jsdom test env (#4750)
• [jest-resolve] Preserve module identity for symlinks (#4761)
• [jest-config] Include error message for preset json (#4766)

Features

• [jest-environment-jsdom] [BREAKING] Upgrade to JSDOM@11 (TBD)
• [jest-environment-*] [BREAKING] Add Async Test Environment APIs, dispose is now teardown (#4506)
• [jest-cli] Add an option to clear the cache (#4430)
• [babel-plugin-jest-hoist] Improve error message, that the second argument of jest.mock must be an inline function (#4593)
• [jest-snapshot] [BREAKING] Concatenate name of test and snapshot (#4460)
• [jest-cli] Add an option to fail if no tests are found (#3672)
• [jest-diff] Highlight only last of odd length leading spaces (#4558)
• [jest-docblock] Add docblock.print() (#4517)
• [jest-docblock] Add strip (#4571)
• [jest-docblock] Preserve leading whitespace in docblock comments (#4576)
• [jest-docblock] remove leading newlines from parswWithComments().comments (#4610)
• [jest-editor-support] Add Snapshots metadata (#4570)
• [jest-editor-support] Adds an 'any' to the typedef for updateFileWithJestStatus (#4636)
• [jest-editor-support] Better monorepo support (#4572)
• [jest-environment-jsdom] Add simple rAF polyfill in jsdom environment to work with React 16 (#4568)
• [jest-environment-node] Implement node Timer api (#4622)
• [jest-jasmine2] Add testPath to reporter callbacks (#4594)
• [jest-mock] Added support for naming mocked functions with .mockName(value) and .mockGetName() (#4586)
• [jest-runtime] Add module.loaded, and make module.require not enumerable (#4623)
• [jest-runtime] Add module.parent (#4614)
• [jest-runtime] Support sourcemaps in transformers (#3458)
• [jest-snapshot] Add a serializer for jest.fn to allow a snapshot of a jest mock (#4668)
• [jest-worker] Initial version of parallel worker abstraction, say hello! (#4497)

Chore & Maintenance

• [*] [BREAKING] Drop support for Node.js version 4
• [babel-jest] Explicitly bump istanbul to newer versions (#4616)
• [expect] Upgrade mocha and rollup for browser testing (#4642)
• [docs] Add info about coveragePathIgnorePatterns (#4602)
• [docs] Add Vuejs series of testing with Jest (#4648)
• [docs] Mention about optional done argument in test function (#4556)
• [jest-cli] Bump node-notifier version (#4609)
• [jest-diff] Simplify highlight for leading and trailing spaces (#4553)
• [jest-get-type] Add support for date (#4621)
• [jest-matcher-utils] Call chalk.inverse for trailing spaces (#4578)
• [jest-runtime] Add .advanceTimersByTime; keep .runTimersToTime() as an alias.

jest 21.2.1

• Fix watchAll not running tests on save (#4550)
• Add missing escape sequences to ConvertAnsi plugin (#4544)

jest 21.2.0

• 🃏 Change license from BSD+Patents to MIT.
• Allow eslint-plugin to recognize more disabled tests (#4533)
• Add babel-plugin for object spread syntax to babel-preset-jest (#4519)
• Display outer element and trailing newline consistently in jest-diff (#4520)
• Do not modify stack trace of JestAssertionError (#4516)
• Print errors after test structure in verbose mode (#4504)
• Fix --silent --verbose problem (#4505)
• Fix: Reset local state of assertions when using hasAssertions (#4498)
• jest-resolve: Prevent default resolver failure when potential resolution directory does not exist (#4483)

jest 21.1.0

• (minor) Use ES module exports (#4454)
• Allow chaining mockClear and mockReset (#4475)
• Call jest-diff and pretty-format more precisely in toHaveProperty matcher (#4445)
• Expose restoreAllMocks to object (#4463)
• Fix function name cleaning when making mock fn (#4464)
• Fix Map/Set equality checker (#4404)
• Make FUNCTION_NAME_RESERVED_PATTERN stateless (#4466)

jest 21.0.2

• Take precedence of NODE_PATH when resolving node_modules directories (#4453)
• Fix race condition with --coverage and babel-jest identical file contents edge case (#4432)
• Add extra parameter --runTestsByPath. (#4411)
• Upgrade all outdated deps (#4425)

jest 21.0.1

• Remove obsolete error (#4417)

jest 21.0.0

• Add --changedFilesWithAncestor (#4070)
• Add --findRelatedFiles (#4131)
• Add --onlyChanged tests (#3977)
• Add contextLines option to jest-diff (#4152)
• Add alternative serialize API for pretty-format plugins (#4114)
• Add displayName to MPR (#4327)
• Add displayName to TestResult (#4408)
• Add es5 build of pretty-format (#4075)
• Add extra info to no tests for changed files message (#4188)
• Add fake chalk in browser builds in order to support IE10 (#4367)
• Add jest.requireActual (#4260)
• Add maxWorkers to globalConfig (#4005)
• Add skipped tests support for jest-editor-support (#4346)
• Add source map support for better debugging experience (#3738)
• Add support for Error objects in toMatchObject (#4339)
• Add support for Immutable.Record in pretty-format (#3678)
• Add tests for extract_requires on export types (#4080)
• Add that toMatchObject can match arrays (#3994)
• Add watchPathIgnorePatterns to exclude paths to trigger test re-run in watch mode (#4331)
• Adding ancestorTitles property to JSON test output (#4293)
• Allow custom resolver to be used with[out] moduleNameMapper (#4174)
• Avoid parsing .require(…) method calls (#3777)
• Avoid unnecessary function declarations and call in pretty-format (#3962)
• Avoid writing to stdout in default reporter if --json is enabled. Fixes #3941 (#3945)
• Better error handling for --config (#4230)
• Call consistent pretty-format plugins within Jest (#3800)
• Change babel-core to peerDependency for compatibility with Babel 7 (#4162)
• Change Promise detection code in jest-circus to support non-global Promise implementations (#4375)
• Changed files eager loading (#3979)
• Check whether we should output to stdout or stderr (#3953)
• Clarify what objects toContain and toContainEqual can be used on (#4307)
• Clean up resolve() logic. Provide useful names for variables and functions. Test that a directory exists before attempting to resolve files within it. (#4325)
• cleanupStackTrace (#3696)
• compare objects with Symbol keys (#3437)
• Complain if expect is passed multiple arguments (#4237)
• Completes nodeCrawl with empty roots (#3776)
• Consistent naming of files (#3798)
• Convert code base to ESM import (#3778)
• Correct summary message for flag --findRelatedTests. (#4309)
• Coverage thresholds can be set up for individual files (#4185)
• custom reporter error handling (#4051)
• Define separate type for pretty-format plugin Options (#3802)
• Delete confusing async keyword (#3679)
• Delete redundant branch in ReactElement and HTMLElement plugins (#3731)
• Don't format node assert errors when there's no 'assert' module (#4376)
• Don't print test summary in --silent (#4106)
• Don't try to build ghost packages (#3934)
• Escape double quotes in attribute values in HTMLElement plugin (#3797)
• Explain how to clear the cache (#4232)
• Factor out common code for collections in pretty-format (#4184)
• Factor out common code for markup in React plugins (#4171)
• Feature/internal resolve (#4315)
• Fix --logHeapUsage (#4176)
• Fix --showConfig to show all project configs (#4078)
• Fix --watchAll (#4254)
• Fix bug when setTimeout is mocked (#3769)
• Fix changedFilesWithAncestor (#4193)
• Fix colors for expected/stored snapshot message (#3702)
• Fix concurrent test failure (#4159)
• Fix for 4286: Compare Maps and Sets by value rather than order (#4303)
• fix forceExit (#4105)
• Fix grammar in React Native docs (#3838)
• Fix inconsistent name of complex values in pretty-format (#4001)
• Fix issue mocking bound method (#3805)
• Fix jest-circus (#4290)
• Fix lint warning in master (#4132)
• Fix linting (#3946)
• fix merge conflict (#4144)
• Fix minor typo (#3729)
• fix missing console.log messages (#3895)
• fix mock return value (#3933)
• Fix mocking for modules with folders on windows (#4238)
• Fix NODE_PATH resolving for relative paths (#3616)
• Fix options.moduleNameMapper override order with preset (#3565 (#3689)
• Fix React PropTypes warning in tests for Immutable plugin (#4412)
• Fix regression in mockReturnValueOnce (#3857)
• Fix sample code of mock class constructors (#4115)
• Fix setup-test-framework-test (#3773)
• fix typescript jest test crash (#4363)
• Fix watch mode (#4084)
• Fix Watchman on windows (#4018)
• Fix(babel): Handle ignored files in babel v7 (#4393)
• Fix(babel): Support upcoming beta (#4403)
• Fixed object matcher (#3799)
• Fixes #3820 use extractExpectedAssertionsErrors in jasmine setup
• Flow upgrade (#4355)
• Force message in matchers to always be a function (#3972)
• Format describe and use test instead of it alias (#3792)
• global_config.js for multi-project runner (#4023)
• Handle async errors (#4016)
• Hard-fail if hasteImpl is throwing an error during initialization. (#3812)
• Ignore import type for extract_requires (#4079)
• Ignore indentation of data structures in jest-diff (#3429)
• Implement 'jest.requireMock' (#4292)
• Improve Jest phabricator plugin (#4195)
• Improve Seq and remove newline from non-min empty in Immutable plugin (#4241)
• Improved the jest reporter with snapshot info per test. (#3660)
• Include fullName in formattedAssertion (#4273)
• Integrated with Yarn workspaces (#3906)
• jest --all (#4020)
• jest-circus test failures (#3770)
• jest-circus Timeouts (#3760)
• jest-haste-map: add test case for broken handling of ignore pattern (#4047)
• jest-haste-map: add test+fix for broken platform module support (#3885)
• jest-haste-map: deprecate functional ignorePattern and use it in cache key (#4063)
• jest-haste-map: mock 'fs' with more idiomatic jest.mock() (#4046)
• jest-haste-map: only file IO errors should be silently ignored (#3816)
• jest-haste-map: throw when trying to get a duplicated module (#3976)
• jest-haste-map: watchman crawler: normalize paths (#3887)
• jest-runtime: atomic cache write, and check validity of data (#4088)
• Join lines with newline in jest-diff (#4314)
• Keep ARGV only in CLI files (#4012)
• let transformers adjust cache key based on mapCoverage (#4187)
• Lift requires (#3780)
• Log stack when reporting errors in jest-runtime (#3833)
• Make --listTests return a new line separated list when not using --json (#4229)
• Make build script printing small-terminals-friendly (#3892)
• Make error messages more explicit for toBeCalledWith assertions (#3913)
• Make jest-matcher-utils use ESM exports (#4342)
• Make jest-runner a standalone package. (#4236)
• Make Jest’s Test Runner configurable. (#4240)
• Make listTests always print to console.log (#4391)
• Make providesModuleNodeModules ignore nested node_modules directories
• Make sure function mocks match original arity (#4170)
• Make sure runAllTimers also clears all ticks (#3915)
• Make toBe matcher error message more helpful for objects and arrays (#4277)
• Make useRealTimers play well with timers: fake (#3858)
• Move getType from jest-matcher-utils to separate package (#3559)
• Multiroot jest-change-files (#3969)
• Output created snapshot when using --ci option (#3693)
• Point out you can use matchers in .toMatchObject (#3796)
• Prevent babelrc package import failure on relative current path (#3723)
• Print RDP details for windows builds (#4017)
• Provide better error checking for transformed content (#3807)
• Provide printText and printComment in markup.js for HTMLElement plugin (#4344)
• Provide regex visualization for testRegex (#3758)
• Refactor CLI (#3862)
• Refactor names and delimiters of complex values in pretty-format (#3986)
• Replace concat(Immutable) with Immutable as item of plugins array (#4207)
• Replace Jasmine with jest-circus (#3668)
• Replace match with test and omit redundant String conversion (#4311)
• Replace print with serialize in AsymmetricMatcher plugin (#4173)
• Replace print with serialize in ConvertAnsi plugin (#4225)
• Replace print with serialize in HTMLElement plugin (#4215)
• Replace print with serialize in Immutable plugins (#4189)
• Replace unchanging args with one config arg within pretty-format (#4076)
• Return UNDEFINED for undefined type in ReactElement plugin (#4360)
• Rewrite some read bumps in pretty-format (#4093)
• Run update method before installing JRE on Circle (#4318)
• Separated the snapshot summary creation from the printing to improve testability. (#4373)
• Set coverageDirectory during normalize phase (#3966)
• Setup custom reporters after default reporters (#4053)
• Setup for Circle 2 (#4149)
• Simplify readme (#3790)
• Simplify snapshots definition (#3791)
• skipNodeResolution config option (#3987)
• Small fixes to toHaveProperty docs (#3878)
• Sort attributes by name in HTMLElement plugin (#3783)
• Specify watchPathIgnorePatterns will only be available in Jest 21+ (#4398)
• Split TestRunner off of TestScheduler (#4233)
• Strict and explicit config resolution logic (#4122)
• Support maxDepth option in React plugins (#4208)
• Support SVG elements in HTMLElement plugin (#4335)
• Test empty Immutable collections with {min: false} option (#4121)
• test to debug travis failure in master (#4145)
• testPathPattern message test (#4006)
• Throw Error When Using Nested It Specs (#4039)
• Throw when moduleNameMapper points to inexistent module (#3567)
• Unified 'no tests found' message for non-verbose MPR (#4354)
• Update migration guide with jest-codemods transformers (#4306)
• Use "inputSourceMap" for coverage re-mapping. (#4009)
• Use "verbose" no test found message when there is only one project (#4378)
• Use babel transform to inline all requires (#4340)
• Use eslint plugins to run prettier (#3971)
• Use iterableEquality in spy matchers (#3651)
• Use modern HTML5 <!DOCTYPE> (#3937)
• Wrap Error.captureStackTrace in a try (#4035)

jest 20.0.4

• Fix jest-haste-map's handling of duplicate module IDs. (#3647)
• Fix behavior of enableAutomock() when automock is set to false. (#3624)
• Fix progress bar in windows. (#3626)

jest 20.0.3

• Fix reporters 'default' setting. (#3562)
• Fix to make Jest fail when the coverage threshold not met. (#3554)

jest 20.0.1

• Add ansi-regex to pretty-format dependencies (#3498)
• Fix replacement in testMatch and moduleDirectories (#3538)
• Fix expect.hasAssertions() to throw when passed arguments (#3526)
• Fix stack traces without proper error messages (#3513)
• Fix support for custom extensions through haste packages (#3537)
• Fix test contexts between test functions (#3506)

jest 20.0.0

• New --projects option to run one instance of Jest in multiple projects at the same time. (#3400)
• New multi project runner (#3156)
• New --listTests flag. (#3441)
• New --showConfig flag. (#3296)
• New promise support for all expect matchers through .resolves and .rejects. (#3068)
• New expect.hasAssertions() function similar to expect.assertions(). (#3379)
• New this.equals function exposed to custom matchers. (#3469)
• New valid-expect lint rule in eslint-plugin-jest. (#3067)
• New HtmlElement pretty-format plugin. (#3230)
• New Immutable pretty-format plugins. (#2899)
• New test environment per file setting through @jest-environment in the docblock. (#2859)
• New feature that allows every configuration option to be set from the command line. (#3424)
• New feature to add custom reporters to Jest through reporters in the configuration. (#3349)
• New feature to add expected and actual values to AssertionError. (#3217)
• New feature to map code coverage from transformers. (#2290)
• New feature to run untested code coverage in parallel. (#3407)
• New option to define a custom resolver. (#2998)
• New printing support for text and comment nodes in html pretty-format. (#3355)
• New snapshot testing FAQ (#3425)
• New support for custom platforms on jest-haste-map. (#3162)
• New support for mocking native async methods. (#3209)
• New guide on how to use Jest with any JavaScript framework. (#3243)
• New translation system for the Jest website.
• New collapsing watch mode usage prompt after first run. (#3078)
• Breaking Change: Forked Jasmine 2.5 into Jest's own test runner and rewrote large parts of Jasmine. (#3147)
• Breaking Change: Jest does not write new snapshots by default on CI. (#3456)
• Breaking Change: Moved the typescript parser from jest-editor-support into a separate jest-test-typescript-parser package. (#2973)
• Breaking Change: Replaced auto-loading of babel-polyfill with only regenerator-runtime, fixes a major memory leak. (#2755)
• Fixed babel-jest to look up the babel field in package.json as a fallback.
• Fixed jest-editor-support's parser to not crash on incomplete ASTs. (#3259)
• Fixed jest-resolve to use is-builtin-module instead of resolve.isCore. (#2997)
• Fixed jest-snapshot to normalize line endings in the serialize function. (#3002)
• Fixed behavior of --silent flag. (#3003)
• Fixed bug with watchers on macOS causing test to crash. (#2957)
• Fixed CLI notify option not taking precedence over config option. (#3340)
• Fixed detection of the npm client in SummaryReporter to support Yarn. (#3263)
• Fixed done.fail not passing arguments (#3241)
• Fixed fake timers to restore after resetting mocks. (#2467)
• Fixed handling of babylon's parser options in jest-editor-support. (#3344)
• Fixed Jest to properly cache transform results. (#3334)
• Fixed Jest to use human-readable colors for Jest's own snapshots. (#3119)
• Fixed jest-config to use UID for default cache folder. (#3380), (#3387)
• Fixed jest-runtime to expose inner error when it fails to write to the cache. (#3373)
• Fixed lifecycle hooks to make afterAll hooks operate the same as afterEach. (#3275)
• Fixed pretty-format to run plugins before serializing nested basic values. (#3017)
• Fixed return value of mocks so they can explicitly be set to return undefined. (#3354)
• Fixed runner to run tests associated with snapshots when the snapshot changes. (#3025)
• Fixed snapshot serializer require, restructured pretty-format. (#3399)
• Fixed support for Babel 7 in babel-jest. (#3271)
• Fixed testMatch to find tests in .folders. (#3006)
• Fixed testNamePattern and testPathPattern to work better together. (#3327)
• Fixed to show reject reason when expecting resolve. (#3134)
• Fixed toHaveProperty() to use hasOwnProperty from Object (#3410)
• Fixed watch mode's screen clearing. (#2959) (#3294)
• Improved and consolidated Jest's configuration file resolution. (#3472)
• Improved documentation throughout the Jest website.
• Improved documentation to explicitly mention that snapshots must be reviewed. (#3203)
• Improved documentation to make it clear CRA users don't need to add dependencies. (#3312)
• Improved eslint-plugin-jest's handling of expect. (#3306)
• Improved flow-coverage, eslint rules and test coverage within the Jest repository.
• Improved printing of expect.assertions error. (#3033)
• Improved Windows test coverage of Jest.
• Refactored configs & transform (#3376)
• Refactored reporters to pass individual Tests to reporters. (#3289)
• Refactored TestRunner (#3166)
• Refactored watch mode prompts. (#3290)
• Deleted jest-file-exists. (#3105)
• Removed Config type. (#3366)
• Removed all usage of jest-file-exists. (#3101)
• Adopted prettier on the Jest codebase.

jest 19.0.1

• Fix infinite loop when using --watch with --coverage.
• Fixed watchman config option.
• Fixed a bug in the jest-editor-support static analysis.
• Fixed eslint plugin warning.
• Fixed missing space in front of "Did you mean …?".
• Fixed path printing in the reporter on Windows.

jest 19.0.0

• Breaking Change: Added a version for snapshots.
• Breaking Change: Removed the mocksPattern configuration option, it never worked correctly.
• Breaking Change: Renamed testPathDirs to roots to avoid confusion when configuring Jest.
• Breaking Change: Updated printing of React elements to cause fewer changes when props change.
• Breaking Change: Updated snapshot format to properly escape data.
• Fixed --color to be recognized correctly again.
• Fixed babel-plugin-jest-hoist to work properly with type annotations in tests.
• Fixed behavior for console.log calls and fixed a memory leak (#2539).
• Fixed cache directory path for Jest to avoid ENAMETOOLONG errors.
• Fixed change events to be emitted in jest-haste-map's watch mode. This fixes issues with Jest's new watch mode and react-native-packager.
• Fixed cli arguments to be used when loading the config from file, they were previously ignored.
• Fixed Jest to load json files that include a BOM.
• Fixed Jest to throw errors instead of ignoring invalid cli options.
• Fixed mocking behavior for virtual modules.
• Fixed mocking behavior with transitive dependencies.
• Fixed support for asymmetric matchers in toMatchObject.
• Fixed test interruption and --bail behavior.
• Fixed watch mode to clean up worker processes when a test run gets interrupted.
• Fixed whitespace to be highlighted in snapshots and assertion errors.
• Improved babel-jest plugin: babel is loaded lazily, istanbul comments are only added when coverage is used.
• Improved error for invalid transform config.
• Improved moduleNameMapper to not overwrite mocks when many patterns map to the same file.
• Improved printing of skipped tests in verbose mode.
• Improved resolution code in jest-resolve.
• Improved to only show patch marks in assertion errors when the comparison results in large objects.
• New --collectCoverageFrom cli argument.
• New --coverageDirectory cli argument.
• New expect.addSnapshotSerializer to add custom snapshot serializers for tests.
• New jest.spyOn.
• New testMatch configuration option that accepts glob patterns.
• New eslint-plugin-jest with no-disabled-tests, no-focuses-tests and no-identical-title rules and default configuration and globals.
• New expect.stringContaining asymmetric matcher.
• New feature to make manual mocks with nested folders work. For example __mocks__/react-native/Library/Text.js will now work as expected.
• New feature to re-run tests through the notification when using --notify.
• New jest-phabricator package to integrate Jest code coverage in phabriactor.
• New jest-validate package to improve configuration errors, help with suggestions of correct configuration and to be adopted in other libraries.
• New pretty-printing for asymmetric matchers.
• New RSS feed for Jest's blog.
• New way to provide a reducer to extract haste module ids.
• New website, new documentation, new color scheme and new homepage.
• Rewritten watch mode for instant feedback, better code quality and to build new features on top of it (#2362).

jest 18.1.0

• Fixed console.log and fake timer behavior in node 7.3.
• Updated istanbul-api.
• Updated jest-diff equality error message.
• Disabled arrow keys when entering a pattern in watch mode to prevent broken behavior. Will be improved in a future release.
• Moved asymmetric matchers and equality functionality from Jasmine into jest-matchers.
• Removed jasmine and jest-snapshot dependency from jest-matchers.
• Removed unused global context variable.
• Show a better error message if the config is invalid JSON.
• Highlight trailing whitespace in assertion diffs and snapshots.
• Jest now uses micromatch instead of minimatch.
• Added -h as alias for --help.

jest 18.0.0

See https://facebook.github.io/jest/blog/2016/12/15/2016-in-jest.html

• The testResultsProcessor function is now required to return the modified results.
• Removed pit and mockImpl. Use it or mockImplementation instead.
• Fixed re-running tests when --bail is used together with --watch.
• pretty-format is now merged into Jest.
• require('v8') now works properly in a test context.
• Jest now clears the entire scrollback in watch mode.
• Added expect.any, expect.anything, expect.objectContaining, expect.arrayContaining, expect.stringMatching.
• Properly resolve snapshotSerializers, setupFiles, transform, testRunner and testResultsProcessor instead of using path.resolve.
• --testResultsProcessor is now exposed through the cli.
• Renamed --jsonOutputFile to --outputFile.
• Added jest-editor-support for vscode and Nuclide integration.
• Fixed test.concurrent unhandled promise rejections.
• The Jest website is now auto-deployed when merging into master.
• Updated testRegex to include test.js and spec.js files.
• Fixes for babel-plugin-jest-hoist when using jest.mock with three arguments.
• The JSON global in jest-environment-node now comes from the vm context instead of the parent context.
• Jest does not print stack traces from babel any longer.
• Fake timers are reset when FakeTimers.useTimers() is called.
• Usage of Jest in watch mode can be hidden through JEST_HIDE_USAGE.
• Added expect.assertions(number) which will ensure that a specified amount of assertions is made in one test.
• Added .toMatchSnapshot(?string) feature to give snapshots a name.
• Escape regex in snapshots.
• jest-react-native was deprecated and now forwards react-native.
• Added .toMatchObject matcher.
• Further improve printing of large objects.
• Fixed NaN% Failed in the OS notification when using --notify.
• The first test run without cached timings will now use separate processes instead of running in band.
• Added .toHaveProperty matcher.
• Fixed Map/Set comparisons.
• test.concurrent now works with --testNamePattern.

jest 17.0.3

• Improved file-watching feature in jest-haste-map.
• Added .toHaveLength matcher.
• Improved .toContain matcher.

jest 17.0.2

• Fixed performance regression in module resolution.

jest 17.0.1

• Fixed pretty printing of big objects.
• Fixed resolution of .native.js files in react-native projects.

jest 17.0.0

• Added expect.extend.
• Properly resolve modules with platform extensions on react-native.
• Added support for custom snapshots serializers.
• Updated to Jasmine 2.5.2.
• Big diffs are now collapsed by default in snapshots and assertions. Added --expand (or -e) to show the full diff.
• Replaced scriptPreprocessor with the new transform option.
• Added jest.resetAllMocks which replaces jest.clearAllMocks.
• Fixes for react-native preset.
• Fixes for global built in objects in jest-environment-node.
• Create mock objects in the vm context instead of the parent context.
• .babelrc is now part of the transform cache key in babel-jest.
• Fixes for docblock parsing with haste modules.
• Exit with the proper code when the coverage threshold is not reached.
• Implemented file watching in jest-haste-map.
• --json now includes information about individual tests inside a file.

jest 16.0.2

• Symbols are now properly mocked when using jest-mock.
• toHaveBeenCalledWith() works without arguments again.
• Newlines in snapshots are now normalized across different operating systems.

jest 16.0.1

• Fix infinite loop.

jest 16.0.0

• Previously failed tests are now always run first.
• A new concurrent reporter shows currently running tests, a test summary, a progress bar and estimated remaining time if possible.
• Improved CLI colors.
• jest <pattern> is now case-insensitive.
• Added it.only, it.skip, test.only, test.skip and xtest.
• Added --testNamePattern=pattern or -t <pattern> to run individual tests in test files.
• Jest now warns for duplicate mock files.
• Pressing a, o, p, q or enter while tests are running in the watch mode, the test run will be interrupted.
• --bail now works together with --watch.
• Added test.concurrent for concurrent async tests.
• Jest now automatically considers files and tests with the .jsx extension.
• Added jest.clearAllMocks to clear all mocks manually.
• Rewrote Jest's snapshot implementation. jest-snapshot can now be more easily integrated into other test runners and used in other projects.
• This requires most snapshots to be updated when upgrading Jest.
• Objects and Arrays in snapshots are now printed with a trailing comma.
• Function names are not printed in snapshots any longer to reduce issues with code coverage instrumentation and different Node versions.
• Snapshots are now sorted using natural sort order.
• Snapshots are not marked as obsolete any longer when using fit or when an error is thrown in a test.
• Finished migration of Jasmine matchers to the new Jest matchers.
• Pretty print toHaveBeenLastCalledWith, toHaveBeenCalledWith, lastCalledWith and toBeCalledWith failure messages.
• Added toBeInstanceOf matcher.
• Added toContainEqual matcher.
• Added toThrowErrorMatchingSnapshot matcher.
• Improved moduleNameMapper resolution.
• Module registry fixes.
• Fixed invocation of the setupTestFrameworkScriptFile script to make it easier to use chai together with Jest.
• Removed react-native special case in Jest's configuration.
• Added --findRelatedTests <fileA> <fileB> cli option to run tests related to the specified files.
• Added jest.deepUnmock to babel-plugin-jest-hoist.
• Added jest.runTimersToTime which is useful together with fake timers.
• Improved automated mocks for ES modules compiled with babel.

jest 15.1.1

• Fixed issues with test paths that include hyphens on Windows.
• Fixed testEnvironment resolution.
• Updated watch file name pattern input.

jest 15.1.0

• Pretty printer updates for React and global window objects.
• jest-runtime overwrites automocking from configuration files.
• Improvements for watch mode on Windows.
• afterAll/afterEach/beforeAll/beforeEach can now return a Promise and be used together with async/await.
• Improved stack trace printing on Node 4.

jest 15.0.2

• Fixed Jest with npm2 when using coverage.

jest 15.0.1

• Updated toThrow and toThrowMatchers and aliased them to the same matcher.
• Improvements for watch mode.
• Fixed Symbol reassignment in tests would break Jest's matchers.
• Fixed --bail option.

jest 15.0.0

• See https://facebook.github.io/jest/blog/2016/09/01/jest-15.html
• Jest by default now also recognizes files ending in .spec.js and .test.js as test files.
• Completely replaced most Jasmine matchers with new Jest matchers.
• Rewrote Jest's CLI output for test failures and summaries.
• Added --env option to override the default test environment.
• Disabled automocking, fake timers and resetting the module registry by default.
• Added --watchAll, made --watch interactive and added the ability to update snapshots and select test patterns in watch mode.
• Jest uses verbose mode when running a single test file.
• Console messages are now buffered and printed along with the test results.
• Fix testEnvironment resolution to prefer jest-environment-{name} instead of {name} only. This prevents a module colision when using jsdom as test environment.
• moduleNameMapper now uses a resolution algorithm.
• Improved performance for small test runs.
• Improved API documentation.
• Jest now works properly with directories that have special characters in them.
• Improvements to Jest's own test infra by merging integration and unit tests. Code coverage is now collected for Jest.
• Added global.global to the node environment.
• Fixed babel-jest-plugin-hoist issues with functions called mock.
• Improved jest-react-native preset with mocks for ListView, TextInput, ActivityIndicator and ScrollView.
• Added collectCoverageFrom to collect code coverage from untested files.
• Rewritten code coverage support.

jest 14.1.0

• Changed Jest's default cache directory.
• Fixed jest-react-native for react 15.3.0.
• Updated react and react-native example to use react-test-renderer.
• Started to refactor code coverage.

jest 14.0.2

• babel-jest bugfix.

jest 14.0.1

• babel-jest can now be used to compose a transformer.
• Updated snapshot instructions to run jest -u or npm test -- -u.
• Fixed config cli option to enable JSON objects as configuration.
• Updated printing of preset path in the CLI.

jest 14.0.0

• Official release of snapshot tests.
• Started to replace Jasmine matchers with Jest matchers: toBe, toBeFalsy, toBeTruthy, toBeNaN, toBe{Greater,Less}Than{,OrEqual}, toBeNull, toBeDefined, toBeUndefined, toContain, toMatch, toBeCloseTo were rewritten.
• Rewrite of Jest's reporters.
• Experimental react-native support.
• Removed Jasmine 1 support from Jest.
• Transform caching improvements.

jest 13.2.0

• Snapshot bugfixes.
• Timer bugfixes.

jest 13.1.0

• Added test global function as an alias for it.
• Added coveragePathIgnorePatterns to the config.
• Fixed printing of "JSX objects" in snapshots.
• Fixes for --verbose option and top level it calls.
• Extended the node environment with more globals.
• testcheck now needs to be required explicitly through require('jest-check').
• Added jest.deepUnmock.
• Fail test suite if it does not contain any tests.

jest 13.0.0

• Added duration of individual tests in verbose mode.
• Added a browser config option to properly resolve npm packages with a browser field in package.json if you are writing tests for client side apps
• Added jest-repl.
• Split up jest-cli into jest-runtime and jest-config.
• Added a notification plugin that shows a test run notification using --notify.
• Refactored TestRunner into SearchSource and improved the "no tests found" message.
• Added jest.isMockFunction(jest.fn()) to test for mock functions.
• Improved test reporter printing and added a test failure summary when running many tests.
  • Add support for property testing via testcheck-js.
• Added a webpack tutorial.
• Added support for virtual mocks through jest.mock('Module', implementation, {virtual: true}).
• Added snapshot functionality through toMatchSnapshot().
• Redesigned website.

jest-cli 12.1.1

• Windows stability fixes.
• Mock module resolution fixes.
• Remove test files from code coverage.

jest-cli 12.1.0

• Jest is now also published in the jest package on npm.
• Added testRegex to match for tests outside of specific folders. Deprecated both testDirectoryName and testFileExtensions.
• it can now return a Promise for async testing. pit was deprecated.
• Added jest-resolve as a standalone package based on the Facebook module resolution algorithm.
• Added jest-changed-files as a standalone package to detect changed files in a git or hg repo.
• Added --setupTestFrameworkFile to cli.
• Added support for coverage thresholds. See http://facebook.github.io/jest/docs/api.html#coveragethreshold-object.
• Updated to jsdom 9.0.
• Updated and improved stack trace reporting.
• Added module.filename and removed the invalid module.__filename field.
• Further improved the lastCalledWith and toBeCalledWith custom matchers. They now print the most recent calls.
• Fixed jest-haste-map on continuous integration systems.
• Fixes for hg/git integration.
• Added a re-try for the watchman crawler.

jest-cli 12.0.2

• Bug fixes when running a single test file and for scoped package names.

jest-cli 12.0.1

• Added custom equality matchers for Map/Set and iterables.
• Bug fixes

jest-cli 12.0.0

• Reimplemented node-haste as jest-haste-map: jestjs#896
• Fixes for the upcoming release of nodejs 6.
• Removed global mock caching which caused negative side-effects on test runs.
• Updated Jasmine from 2.3.4 to 2.4.1.
• Fixed our Jasmine fork to work better with Object.create(null).
• Added a --silent flag to silence console messages during a test run.
• Run a test file directly if a path is passed as an argument to Jest.
• Added support for the undocumented nodejs feature module.paths.

jest-cli 11.0.2

• Fixed jest -o error when Mercurial isn't installed on the system
• Fixed Jasmine failure message when expected values were mutated after tests.

jest-cli 11.0.1, babel-jest 11.0.1

• Added support for Mercurial repositories when using jest -o
• Added mockImplementationOnce API to jest.fn().

jest-cli 11.0.0, babel-jest 11.0.0 (pre-releases 0.9 to 0.10)

• New implementation of node-haste and rewrite of internal module loading and resolution. Fixed both startup and runtime performance. #599
• Jasmine 2 is now the default test runner. To keep using Jasmine 1, put testRunner: "jasmine1" into your configuration.
• Added jest-util, jest-mock, jest-jasmine1, jest-jasmine2, jest-environment-node, jest-environment-jsdom packages.
• Added babel-jest-preset and babel-jest as packages. babel-jest is now being auto-detected.
• Added babel-plugin-jest-hoist which hoists jest.unmock, jest.mock and the new jest.enableAutomock and jest.disableAutomock API.
• Improved babel-jest integration and react-native testing.
• Improved code coverage reporting when using babel-jest.
• Added the jest.mock('moduleName', moduleFactory) feature. jest.mock now gets hoisted by default. jest.doMock was added to explicitly mock a module without the hoisting feature of babel-jest.
• Updated jsdom to 8.3.x.
• Improved responsiveness of the system while using --watch.
• Clear the terminal window when using --watch.
• By default, --watch will now only runs tests related to changed files. --watch=all can be used to run all tests on file system changes.
• Debounce --watch re-runs to not trigger test runs during a branch switch in version control.
• Added jest.fn() and jest.fn(implementation) as convenient shorcuts for jest.genMockFunction() and jest.genMockFunction().mockImplementation().
• Added an automock option to turn off automocking globally.
• Added a "no tests found" message if no tests can be found.
• Jest sets process.NODE_ENV to test unless otherwise specified.
• Fixed moduleNameMapper config option when used with paths.
• Fixed an error with Jasmine 2 and tests that throw 'string errors'.
• Fixed issues with unmocking symlinked module names.
• Fixed mocking of boolean values.
• Fixed mocking of fields that start with an underscore ("private fields").
• Fixed unmocking behavior with npm3.
• Fixed and improved --onlyChanged option.
• Fixed support for running Jest as a git submodule.
• Improved verbose logger output
• Fixed test runtime error reporting and stack traces.
• Improved toBeCalled Jasmine 2 custom matcher messages.
• Improved error reporting when a syntax error occurs.
• Renamed HasteModuleLoader to Runtime.
• Jest now properly reports pending tests disabled with xit and xdescribe.
• Removed preprocessCachingDisabled config option.
• Added a testEnvironment option to customize the sandbox environment.
• Added support for @scoped/name npm packages.
• Added an integration test runner for Jest that runs all tests for examples and packages.

0.8.2

• Performance improvements.
• jest now uses chalk instead of its own colors implementation.

0.8.1

• --bail now reports with the proper error code.
• Fixed loading of the setup file when using jasmine2.
• Updated jsdom to 7.2.0.

0.8.0

• Added optional support for jasmine2 through the testRunner config option.
• Fixed mocking support for Map, WeakMap and Set.
• node was added to the defaults in moduleFileExtensions.
• Updated the list of node core modules that are properly being recognized by the module loader.

0.7.1

• Correctly map process.on into jsdom environments, fixes a bug introduced in jest 0.7.0.

0.7.0

• Fixed a memory leak with test contexts. Jest now properly cleans up test environments after each test. Added --logHeapUsage to log memory usage after each test. Note: this is option is meant for debugging memory leaks and might significantly slow down your test run.
• Removed mock-modules, node-haste and mocks virtual modules. This is a breaking change of undocumented public API. Usage of this API can safely be automatically updated through an automated codemod:
• Example: http://astexplorer.net/#/zrybZ6UvRA
• Codemod: https://github.com/cpojer/js-codemod/blob/master/transforms/jest-update.js
• jscodeshift: https://github.com/facebook/jscodeshift
• Removed navigator.onLine and mockSetReadOnlyProperty from the global jsdom environment. Use window.navigator.onLine = true; in your test setup and Object.defineProperty instead.

0.6.1

• Updated jsdom to 7.0.2.
• Use the current working directory as root when passing a jest config from the command line.
• Updated the React examples and getting started guide
• Modules now receive a module.parent field so unmocked modules don't assume they are run directly any longer.

0.6.0

• jest now reports the number of tests that were run instead of the number of test files.
• Added a --json option to print test results as JSON.
• Changed the preprocessor API. A preprocessor now receives the script, file and config. The cache key function receives the script, file and stringified config to be able to create consistent hashes.
• Removed node-worker-pool in favor of node-worker-farm (#540).
• toEqual now also checks the internal class name of an object. This fixes invalid tests like expect([]).toEqual({}) which were previously passing.
• Added the option to provide map modules to stub modules by providing the moduleNameMapper config option.
• Allow to specify a custom testRunner in the configuration (#531).
• Added a --no-cache option to make it easier to debug preprocessor scripts.
• Fix code coverage on windows (#499).

0.5.6

• Cache test run performance and run slowest tests first to maximize worker utilization
• Update to jsdom 6.5.0

0.5.5

• Improve failure stack traces.
• Fix syntax error reporting.
• Add --watch option (#472).

0.5.2

• Fixed a bug with syntax errors in test files (#487).
• Fixed chmod error for preprocess-cache (#491).
• Support for the upcoming node 4.0 release (#490, #489).

0.5.1

• Upgraded node-worker-pool to 3.0.0, use the native Promise implementation.
• testURL can be used to set the location of the jsdom environment.
• Updated all of jest's dependencies, now using jsdom 6.3.
• jest now uses the native Promise implementation.
• Fixed a bug when passed an empty testPathIgnorePatterns.
• Moved preprocessor cache into the haste cache directory.

0.5.0

• Added --noStackTrace option to disable stack traces.
• Jest now only works with iojs v2 and up. If you are still using node we recommend upgrading to iojs or keep using jest 0.4.0.
• Upgraded to jsdom 6.1.0 and removed all the custom jsdom overwrites.

<=0.4.0

• See commit history for changes in previous versions of jest.