jest-util

Fixes

• jest-resolve: Use module.builtinModules as BUILTIN_MODULES when it exists

• removed

  jest-worker: Remove debug and inspect flags from the arguments sent to the child

• jest-config: Use all --testPathPattern and <regexForTestFiles> args in testPathPattern

• jest-cli: Do not support --watch inside non-version-controlled environments

• jest-config: Escape Windows path separator in testPathPattern CLI arguments

• jest-jasmine: Register sourcemaps as node environment to improve performance with jsdom

• pretty-format: Do not call toJSON recursively

• pretty-format: Fix errors when identity-obj-proxy mocks CSS Modules

• babel-jest: Fix support for namespaced babel version 7

• expect: Fix .toThrow for promises

• jest-docblock: Pragmas should preserve urls

• jest-cli: Check if npm_lifecycle_script calls Jest directly

• jest-cli: Fix --showConfig to show all configs

• jest-cli: Throw if maxWorkers doesn't have a value

• jest-cli: Use fs.realpathSync.native if available

• jest-config: Fix --passWithNoTests

• jest-config: Support rootDir tag in testEnvironment

• jest-editor-support: Fix --showConfig to support jest 20 and jest 21

• jest-editor-support: Fix editor support test for node 4

• jest-mock: Support mocking constructor in mockImplementationOnce

• jest-runtime: Fix manual user mocks not working with custom resolver

• jest-util: Fix runOnlyPendingTimers for setTimeout inside setImmediate

• jest-message-util: Always remove node internals from stacktraces

• jest-resolve: Changes method of determining builtin modules to include missing builtins

• pretty-format: Prevent error in pretty-format for window in jsdom test env

• jest-resolve: Preserve module identity for symlinks

• jest-config: Include error message for preset json

• pretty-format: Throw PrettyFormatPluginError if a plugin halts with an exception

• expect: Keep the stack trace unchanged when PrettyFormatPluginError is thrown by pretty-format

• jest-environment-jsdom: Fix asynchronous test will fail due to timeout issue.

• jest-cli: Fix --onlyChanged path case sensitivity on Windows platform

• jest-runtime: Use realpath to match transformers

• breaking

  expect: Replace identity equality with Object.is in toBe matcher

Features

• jest-config: Add Global Setup/Teardown options

• jest-config: Add testEnvironmentOptions to apply to jsdom options or node context.

• jest-jasmine2: Update Timeout error message to jest.timeout and display current timeout value

• jest-runner: Enable experimental detection of leaked contexts

• jest-cli: Add combined coverage threshold for directories.

• jest-mock: Add timestamps to mock state.

• eslint-plugin-jest: Add prefer-to-have-length lint rule.

• breaking

  jest-environment-jsdom: Upgrade to JSDOM@11

• breaking

  jest-environment-*: Add Async Test Environment APIs, dispose is now teardown

• jest-cli: Add an option to clear the cache

• babel-plugin-jest-hoist: Improve error message, that the second argument of jest.mock must be an inline function

• breaking

  jest-snapshot: Concatenate name of test and snapshot

• breaking

  jest-cli: Fail if no tests are found

• jest-diff: Highlight only last of odd length leading spaces

• jest-docblock: Add docblock.print()

• jest-docblock: Add strip

• jest-docblock: Preserve leading whitespace in docblock comments

• jest-docblock: Remove leading newlines from parswWithComments().comments

• jest-editor-support: Add Snapshots metadata

• jest-editor-support: Adds an 'any' to the typedef for updateFileWithJestStatus

• jest-editor-support: Better monorepo support

• jest-environment-jsdom: Add simple rAF polyfill in jsdom environment to work with React 16

• jest-environment-node: Implement node Timer api

• jest-jasmine2: Add testPath to reporter callbacks

• jest-mock: Added support for naming mocked functions with .mockName(value) and .mockGetName()

• jest-runtime: Add module.loaded, and make module.require not enumerable

• jest-runtime: Add module.parent

• jest-runtime: Support sourcemaps in transformers

• breaking

  jest-snapshot: Add a serializer for jest.fn to allow a snapshot of a jest mock

• jest-worker: Initial version of parallel worker abstraction, say hello!

• jest-jasmine2: Add testLocationInResults flag to add location information per spec to test results

• jest-environment-jsdom: Update JSOM to 11.4, which includes built-in support for requestAnimationFrame

• jest-cli: Hide watch usage output when running on non-interactive environments

• jest-snapshot: Promises support for toThrowErrorMatchingSnapshot

• jest-cli: Explain which snapshots are obsolete

Chore & Maintenance

• breaking

  *: Drop support for Node.js version 4

• 🃏 Change license from BSD+Patents to MIT.

• Allow eslint-plugin to recognize more disabled tests

• Add babel-plugin for object spread syntax to babel-preset-jest

• Display outer element and trailing newline consistently in jest-diff

• Do not modify stack trace of JestAssertionError

• Print errors after test structure in verbose mode

• Fix --silent --verbose problem

• Reset local state of assertions when using hasAssertions

• jest-resolve: Prevent default resolver failure when potential resolution directory does not exist

• (minor) Use ES module exports

• Allow chaining mockClear and mockReset

• Call jest-diff and pretty-format more precisely in toHaveProperty matcher

• Expose restoreAllMocks to object

• Fix function name cleaning when making mock fn

• Fix Map/Set equality checker

• Make FUNCTION_NAME_RESERVED_PATTERN stateless

• Take precedence of NODE_PATH when resolving node_modules directories

• Fix race condition with --coverage and babel-jest identical file contents edge case

• Add extra parameter --runTestsByPath.

• Upgrade all outdated deps

• Add --changedFilesWithAncestor

• Add --findRelatedFiles

• Add --onlyChanged tests

• Add contextLines option to jest-diff

• Add alternative serialize API for pretty-format plugins

• Add displayName to MPR

• Add displayName to TestResult

• Add es5 build of pretty-format

• Add extra info to no tests for changed files message

• Add fake chalk in browser builds in order to support IE10

• Add jest.requireActual

• Add maxWorkers to globalConfig

• Add skipped tests support for jest-editor-support

• Add source map support for better debugging experience

• Add support for Error objects in toMatchObject

• Add support for Immutable.Record in pretty-format

• Add tests for extract_requires on export types

• Add that toMatchObject can match arrays

• Add watchPathIgnorePatterns to exclude paths to trigger test re-run in watch mode

• Adding ancestorTitles property to JSON test output

• Allow custom resolver to be used with[out] moduleNameMapper

• Avoid parsing .require(…) method calls

• Avoid unnecessary function declarations and call in pretty-format

• Avoid writing to stdout in default reporter if --json is enabled. Fixes #3941

• Better error handling for --config

• Call consistent pretty-format plugins within Jest

• Change babel-core to peerDependency for compatibility with Babel 7

• Change Promise detection code in jest-circus to support non-global Promise implementations

• Changed files eager loading

• Check whether we should output to stdout or stderr

• Clarify what objects toContain and toContainEqual can be used on

• Clean up resolve() logic. Provide useful names for variables and functions. Test that a directory exists before attempting to resolve files within it.

• cleanupStackTrace

• Compare objects with Symbol keys

• Complain if expect is passed multiple arguments

• Completes nodeCrawl with empty roots

• Consistent naming of files

• Convert code base to ESM import

• Correct summary message for flag --findRelatedTests.

• Coverage thresholds can be set up for individual files

• Custom reporter error handling

• Define separate type for pretty-format plugin Options

• Delete confusing async keyword

• Delete redundant branch in ReactElement and HTMLElement plugins

• Don't format node assert errors when there's no 'assert' module

• Don't print test summary in --silent

• Don't try to build ghost packages

• Escape double quotes in attribute values in HTMLElement plugin

• Explain how to clear the cache

• Factor out common code for collections in pretty-format

• Factor out common code for markup in React plugins

• Feature/internal resolve

• Fix --logHeapUsage

• Fix --showConfig to show all project configs

• Fix --watchAll

• Fix bug when setTimeout is mocked

• Fix changedFilesWithAncestor

• Fix colors for expected/stored snapshot message

• Fix concurrent test failure

• Fix for 4286: Compare Maps and Sets by value rather than order

• Fix forceExit

• Fix grammar in React Native docs

• Fix inconsistent name of complex values in pretty-format

• Fix issue mocking bound method

• Fix jest-circus

• Fix lint warning in master

• Fix linting

• Fix merge conflict

• Fix missing console.log messages

• Fix mock return value

• Fix mocking for modules with folders on windows

• Fix NODE_PATH resolving for relative paths

• Fix options.moduleNameMapper override order with preset (#3565

• Fix React PropTypes warning in tests for Immutable plugin

• Fix regression in mockReturnValueOnce

• Fix sample code of mock class constructors

• Fix setup-test-framework-test

• Fix typescript jest test crash

• Fix watch mode

• Fix Watchman on windows

• babel: Handle ignored files in babel v7

• babel: Support upcoming beta

• Fixed object matcher

• Fixes #3820 use extractExpectedAssertionsErrors in jasmine setup

• Flow upgrade

• Force message in matchers to always be a function

• Format describe and use test instead of it alias

• global_config.js for multi-project runner

• Handle async errors

• Hard-fail if hasteImpl is throwing an error during initialization.

• Ignore import type for extract_requires

• Ignore indentation of data structures in jest-diff

• Implement 'jest.requireMock'

• Improve Jest phabricator plugin

• Improve Seq and remove newline from non-min empty in Immutable plugin

• Improved the jest reporter with snapshot info per test.

• Include fullName in formattedAssertion

• Integrated with Yarn workspaces

• Jest --all

• jest-circus test failures

• jest-circus Timeouts

• jest-haste-map: Add test case for broken handling of ignore pattern

• jest-haste-map: Add test+fix for broken platform module support

• deprecated

  jest-haste-map: Deprecate functional ignorePattern and use it in cache key

• jest-haste-map: Mock 'fs' with more idiomatic jest.mock()

• jest-haste-map: Only file IO errors should be silently ignored

• jest-haste-map: Throw when trying to get a duplicated module

• jest-haste-map: Watchman crawler: normalize paths

• jest-runtime: Atomic cache write, and check validity of data

• Join lines with newline in jest-diff

• Keep ARGV only in CLI files

• Let transformers adjust cache key based on mapCoverage

• Lift requires

• Log stack when reporting errors in jest-runtime

• Make --listTests return a new line separated list when not using --json

• Make build script printing small-terminals-friendly

• Make error messages more explicit for toBeCalledWith assertions

• Make jest-matcher-utils use ESM exports

• Make jest-runner a standalone package.

• Make Jest’s Test Runner configurable.

• Make listTests always print to console.log

• Make providesModuleNodeModules ignore nested node_modules directories

• Make sure function mocks match original arity

• Make sure runAllTimers also clears all ticks

• Make toBe matcher error message more helpful for objects and arrays

• Make useRealTimers play well with timers: fake

• Move getType from jest-matcher-utils to separate package

• Multiroot jest-change-files

• Output created snapshot when using --ci option

• Point out you can use matchers in .toMatchObject

• Prevent babelrc package import failure on relative current path

• Print RDP details for windows builds

• Provide better error checking for transformed content

• Provide printText and printComment in markup.js for HTMLElement plugin

• Provide regex visualization for testRegex

• Refactor CLI

• Refactor names and delimiters of complex values in pretty-format

• Replace concat(Immutable) with Immutable as item of plugins array

• Replace Jasmine with jest-circus

• Replace match with test and omit redundant String conversion

• Replace print with serialize in AsymmetricMatcher plugin

• Replace print with serialize in ConvertAnsi plugin

• Replace print with serialize in HTMLElement plugin

• Replace print with serialize in Immutable plugins

• Replace unchanging args with one config arg within pretty-format

• Return UNDEFINED for undefined type in ReactElement plugin

• Rewrite some read bumps in pretty-format

• Run update method before installing JRE on Circle

• Separated the snapshot summary creation from the printing to improve testability.

• Set coverageDirectory during normalize phase

• Setup custom reporters after default reporters

• Setup for Circle 2

• Simplify readme

• Simplify snapshots definition

• skipNodeResolution config option

• Small fixes to toHaveProperty docs

• Sort attributes by name in HTMLElement plugin

• Specify watchPathIgnorePatterns will only be available in Jest 21+

• Split TestRunner off of TestScheduler

• Strict and explicit config resolution logic

• Support maxDepth option in React plugins

• Support SVG elements in HTMLElement plugin

• Test empty Immutable collections with {min: false} option

• Test to debug travis failure in master

• testPathPattern message test

• Throw Error When Using Nested It Specs

• Throw when moduleNameMapper points to inexistent module

• Unified 'no tests found' message for non-verbose MPR

• Update migration guide with jest-codemods transformers

• Use "inputSourceMap" for coverage re-mapping.

• Use "verbose" no test found message when there is only one project

• Use babel transform to inline all requires

• Use eslint plugins to run prettier

• Use iterableEquality in spy matchers

• Use modern HTML5 <!DOCTYPE>

• Wrap Error.captureStackTrace in a try

• Add ansi-regex to pretty-format dependencies

• Fix <rootDir> replacement in testMatch and moduleDirectories

• Fix expect.hasAssertions() to throw when passed arguments

• Fix stack traces without proper error messages

• Fix support for custom extensions through haste packages

• Fix test contexts between test functions

• New --projects option to run one instance of Jest in multiple projects at the same time.

• New multi project runner

• New --listTests flag.

• New --showConfig flag.

• New promise support for all expect matchers through .resolves and .rejects.

• New expect.hasAssertions() function similar to expect.assertions().

• New this.equals function exposed to custom matchers.

• New valid-expect lint rule in eslint-plugin-jest.

• New HtmlElement pretty-format plugin.

• New Immutable pretty-format plugins.

• New test environment per file setting through @jest-environment in the docblock.

• New feature that allows every configuration option to be set from the command line.

• New feature to add custom reporters to Jest through reporters in the configuration.

• New feature to add expected and actual values to AssertionError.

• New feature to map code coverage from transformers.

• New feature to run untested code coverage in parallel.

• New option to define a custom resolver.

• New printing support for text and comment nodes in html pretty-format.

• New snapshot testing FAQ

• New support for custom platforms on jest-haste-map.

• New support for mocking native async methods.

• New guide on how to use Jest with any JavaScript framework.

• New translation system for the Jest website.

• New collapsing watch mode usage prompt after first run.

• breaking

  Forked Jasmine 2.5 into Jest's own test runner and rewrote large parts of Jasmine.

• breaking

  Jest does not write new snapshots by default on CI.

• breaking

  Moved the typescript parser from jest-editor-support into a separate jest-test-typescript-parser package.

• breaking

  Replaced auto-loading of babel-polyfill with only regenerator-runtime, fixes a major memory leak.

• 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.

• Fixed jest-resolve to use is-builtin-module instead of resolve.isCore.

• Fixed jest-snapshot to normalize line endings in the serialize function.

• Fixed behavior of --silent flag.

• Fixed bug with watchers on macOS causing test to crash.

• Fixed CLI notify option not taking precedence over config option.

• Fixed detection of the npm client in SummaryReporter to support Yarn.

• Fixed done.fail not passing arguments

• Fixed fake timers to restore after resetting mocks.

• Fixed handling of babylon's parser options in jest-editor-support.

• Fixed Jest to properly cache transform results.

• Fixed Jest to use human-readable colors for Jest's own snapshots.

• Fixed jest-config to use UID for default cache folder. (#3380),

• Fixed jest-runtime to expose inner error when it fails to write to the cache.

• Fixed lifecycle hooks to make afterAll hooks operate the same as afterEach.

• Fixed pretty-format to run plugins before serializing nested basic values.

• Fixed return value of mocks so they can explicitly be set to return undefined.

• Fixed runner to run tests associated with snapshots when the snapshot changes.

• Fixed snapshot serializer require, restructured pretty-format.

• Fixed support for Babel 7 in babel-jest.

• Fixed testMatch to find tests in .folders.

• Fixed testNamePattern and testPathPattern to work better together.

• Fixed to show reject reason when expecting resolve.

• Fixed toHaveProperty() to use hasOwnProperty from Object

• Fixed watch mode's screen clearing.

• Improved and consolidated Jest's configuration file resolution.

• Improved documentation throughout the Jest website.

• Improved documentation to explicitly mention that snapshots must be reviewed.

• Improved documentation to make it clear CRA users don't need to add dependencies.

• Improved eslint-plugin-jest's handling of expect.

• Improved flow-coverage, eslint rules and test coverage within the Jest repository.

• Improved printing of expect.assertions error.

• Improved Windows test coverage of Jest.

• Refactored configs & transform

• Refactored reporters to pass individual Tests to reporters.

• Refactored TestRunner

• Refactored watch mode prompts.

• Deleted jest-file-exists.

• Removed Config type.

• Removed all usage of jest-file-exists.

• Adopted prettier on the Jest codebase.

• 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.

• breaking

  Added a version for snapshots.

• breaking

  Removed the mocksPattern configuration option, it never worked correctly.

• breaking

  Renamed testPathDirs to roots to avoid confusion when configuring Jest.

• breaking

  Updated printing of React elements to cause fewer changes when props change.

• breaking

  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).

• 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.

See jestjs.io/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.

• 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.

• 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

  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.

• 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.

• 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 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.

• 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.

• 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.

• 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.

• 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 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 jestjs.io/docs/en/configuration.

• 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.