babel-jest

We skipped 24.2.0 because a draft was accidentally published. Please use 24.3.0 or a newer version instead.

Features

• : Improve report when matcher fails, part 10

• : Improve report when matcher fails, part 11

• : Improve report when matcher fails, part 12

• : Improve report when matcher fails, part 7

• : Improve report when matcher fails, part 8

• : Improve report when matcher fails, part 9

• jest-circus/jest-jasmine2: Warn if describe returns a value

• jest-config: Print error information on preset normalization error

• jest-get-type: Add isPrimitive function

• jest-haste-map: Add skipPackageJson option

• jest-util: Add isPromise

• pretty-format: Support React.memo

Fixes

• expect: Fix toStrictEqual not considering arrays with objects having undefined values correctly

• expect: Fix custom async matcher stack trace

• expect: Fix non-object received value in toHaveProperty (#7986, #8067)

• expect: Fix non-symmetric equal for Number

• removed

  expect: Remove duck typing and obsolete browser support code when comparing DOM nodes and use DOM-Level-3 API instead

• jest-changed-files: Fix getChangedFilesFromRoots to not return parts of the commit messages as if they were files, when the commit messages contained multiple paragraphs

• jest-changed-files: Fix pattern for HG changed files

• jest-changed-files: Improve default file selection for Mercurial repos

• jest-circus: Fix bug with test.only

• : Throw explicit error when errors happen after test is considered complete

• security

  jest-cli: Fix prototype pollution vulnerability in dependency

• jest-cli: Refactor -o and --coverage combined

• jest-environment-node: Add missing globals: TextEncoder and TextDecoder

• jest-haste-map: Enforce uniqueness in names (mocks and haste ids)

• : Throw explicit error when errors happen after test is considered complete

• jest-mock: Adds a type check to prototype to allow mocks of objects with a primitive prototype property.

• jest-transform: Normalize config and remove unnecessary checks, convert TestUtils.js to TypeScript

• Make sure to not fail if unable to assign toStringTag to the process object, which is read only in Node 12

• jest-validate: Fix validating async functions

• jest-worker: Fix jest-worker when using pre-allocated jobs

• static: Remove console log '-' on the front page

Performance

• jest-haste-map: Optimize haste map tracking of deleted files with Watchman.

Features

• : Pass default resolver into custom resolvers

• : global{Setup,Teardown} use default export with es modules

• jest-runtime: Better error messages when the jest environment is used after teardown by async code

• jest-jasmine2: Will now only execute at most 5 concurrent tests within the same testsuite when using test.concurrent

• jest-circus: Same as [jest-jasmine2], only 5 tests will run concurrently by default

• jest-config: A new maxConcurrency option allows to change the number of tests allowed to run concurrently

Fixes

• jest-runtime: Fix for mocks not working with module name mapper

• jest-cli: Break dependency cycle when using Jest programmatically

• jest-config: Extract setupFilesAfterEnv from preset

• jest-cli: Do not execute any globalSetup or globalTeardown if there are no tests to execute

• jest-runtime: Lock down version of write-file-atomic

• jest-cli: Print log entries when logging happens after test environment is torn down

• jest-config: Do not use a uuid as name since that breaks caching

• jest-config: Make sure normalize can consume Defaults without warnings

• jest-config: Allow moduleFileExtensions without 'js' for custom runners

• jest-cli: Load transformers before installing require hooks

• jest-cli: Handle missing numTodoTests in test results

• jest-runtime: Exclude setup/teardown files from coverage report

• babel-jest: Throw an error if babel-jest tries to transform a file ignored by Babel

• babel-plugin-jest-hoist: Ignore TS type references when looking for out-of-scope references

• expect: Fixed asymmetrical equality of cyclic objects

Features

• breaking

  jest-each: Add primitive pretty printing for interpolated titles

• jest-runtime: Add jest.isolateModules for scoped module initialization

• breaking

  jest-diff: Support diffing numbers and booleans instead of returning null for different ones

• breaking

  jest-diff: Replace diff with diff-sequences package

• breaking

  jest-cli: Only set error process error codes when they are non-zero

• breaking

  jest-config: Deprecate setupTestFrameworkScriptFile in favor of new setupFilesAfterEnv

• breaking

  jest-worker: Add functionality to call a setup method in the worker before the first call and a teardown method when ending the farm

• breaking

  jest-config: Set default notifyMode to failure-change

• breaking

  jest-haste-map: Remove support for @providesModule

• breaking

  jest-haste-map: Replace internal data structures to improve performance

• breaking

  jest-haste-map: Use relative paths to allow remote caching

• breaking

  jest-haste-map: Remove name from hash in HasteMap.getCacheFilePath

• breaking

  babel-preset-jest: Export a function instead of an object for Babel 7 compatibility

• breaking

  jest-haste-map: Expose relative paths when getting the file iterator

• breaking

  jest-cli: Run code transforms over global{Setup,Teardown}

• jest-haste-map: Add hasteFS.getSize(path)

• jest-cli: Print version ending in -dev when running a local Jest clone

• jest-cli: Add Support for globalSetup and globalTeardown in projects

• jest-runtime: Add extraGlobals to config to load extra global variables into the execution vm

• jest-util: Export specialChars containing Unicode characters and ANSI escapes for console output

• jest-config: Handle typescript (ts and tsx) by default

• jest-validate: Add support for comments in package.json using a "//" key

• jest-config: Add shorthand for watch plugins and runners

• jest-jasmine2/jest-circus/jest-cli: Add test.todo

• pretty-format: Option to not escape strings in diff messages

• jest-haste-map: Add getFileIterator to HasteFS for faster file iteration

• jest-config: Add readConfigs function, previously in jest-cli

• jest-snapshot: Enable configurable snapshot paths

• pretty-format: Support HTMLCollection and NodeList in DOMCollection plugin

• jest-runtime: Pass the normalized configuration to script transformers

• expect: Improve report when assertion fails, part 3

• jest-runtime: If require fails without a file extension, print all files that match with one

• jest-haste-map: Make ignorePattern optional

• jest-haste-map: Add getCacheFilePath to get the path to the cache file for a HasteMap instance

• jest-runtime: Remove cacheDirectory from ignorePattern for HasteMap if not necessary

• jest-validate: Add syntax to validate multiple permitted types

• jest-config: Accept an array as as well as a string for testRegex ([#7209]#7209))

• expect/jest-matcher-utils: Improve report when assertion fails, part 4

• expect/jest-matcher-utils: Improve report when assertion fails, part 5

• expect: Check constructor equality in .toStrictEqual()

• jest-util: Add jest.getTimerCount() to get the count of scheduled fake timers

• jest-config: Add dependencyExtractor option to use a custom module to extract dependencies from files (#7313, #7349, #7350, #7362)

• jest-haste-map: Accept a getCacheKey method in hasteImplModulePath modules to reset the cache when the logic changes

• jest-config: Add haste.computeSha1 option to compute the sha-1 of the files in the haste map

• expect: expect(Infinity).toBeCloseTo(Infinity) Treats Infinity as equal in toBeCloseTo matcher

• jest-worker: Add node worker-thread support to jest-worker

• jest-config: Allow bail setting to be configured with a number allowing tests to abort after n of failures

• jest-config: Allow % based configuration of --max-workers

• jest-runner: Instantiate the test environment class with the current testPath

• jest-config: Always resolve jest-environment-jsdom from jest-config

• expect: Improve report when assertion fails, part 6

• jest-worker: Add enableWorkerThreads option to explicitly opt-in to worker_threads if available

Fixes

• expect: Accept inherited properties in toHaveProperty matcher

• jest-diff: Do not claim that -0 and 0 have no visual difference

• jest-mock: Fix automock for numeric function names

• jest-config: Ensure existsSync is only called with a string parameter

• expect: toStrictEqual considers sparseness of arrays.

• jest-cli: Fix empty coverage data for untested files

• breaking

  jest-cli: Do not use text-summary coverage reporter by default if other reporters are configured

• breaking

  jest-mock: Fix bugs with mock/spy result tracking of recursive functions

• breaking

  jest-haste-map: Recover files correctly after haste name collisions are fixed

• breaking

  pretty-format: Omit non-enumerable symbol properties

• breaking

  *: Upgrade to Babel 7, dropping support for Babel 6

• jest-cli: Avoid watch mode causing bad terminal behavior in some cases

• jest-runner/jest-worker: Fix missing console output in verbose mode

• expect: Standardize file naming in expect

• jest-each: Add empty array validation check

• jest-cli: Interrupt tests if interactive watch plugin key is pressed

• jest-each: Add each array validation check

• jest-haste-map: Do not visit again files with the same sha-1

• jest-jasmine2: Fix memory leak in Error objects hold by the framework

• jest-haste-map: Fixed Haste whitelist generation for scoped modules on Windows

• jest-mock: Fix inheritance of static properties and methods in mocks

• jest-mock: Fix mocking objects without Object.prototype in their prototype chain

• jest-mock: Check _isMockFunction is true rather than truthy on potential mocks

• jest-cli: Update jest-cli to show git ref in message when using changedSince

• [jest-jasmine2] Fix crash when test return Promise rejected with null

• jest-runtime: Check _isMockFunction is true rather than truthy on potential global mocks

• jest-jasmine: Show proper error message from async assert errors

• jest-jasmine2: Better error message when a describe block is empty

• jest-jasmine2: Pending calls inside async tests are reported as pending not failed

• jest-circus: Better error message when a describe block is empty

• jest-jasmine2: Add missing testLocationResults for xit and fit

• expect: Return false from asymmetric matchers if received value isn’t string

• jest-cli: Fix unhandled error when a bad revision is provided to changedSince

• jest-config: Moved dynamically assigned cwd from jest-cli to default configuration in jest-config

• jest-config: Fix getMaxWorkers on termux

• jest-runtime: Throw an explicit error if js is missing from moduleFileExtensions

• jest-runtime: Fix missing coverage when using negative glob pattern in testMatch

• *: Ensure maxWorkers is at least 1 (was 0 in some cases where there was only 1 CPU)

• jest-runtime: Fix transform cache invalidation when requiring a test file from multiple projects

• jest-changed-files: Return correctly the changed files when using lastCommit=true on Mercurial repositories

• babel-jest: Cache includes babel environment variables

• jest-config: Use strings instead of RegExp instances in normalized configuration

• jest-circus: Make sure to display real duration even if time is mocked

• expect: Improves the failing message for toStrictEqual matcher.

• expect: Improves the failing message for toEqual matcher.

• jest-resolve: Fix not being able to resolve path to mapped file with custom platform

• jest-message-util: Improve parsing of error messages for unusually formatted stack traces

• jest-runtime: Ensure error message text is not lost on errors with code frames

• jest-haste-map: Fix to resolve path that is start with words same as rootDir

• expect: Fix toMatchObject matcher when used with Object.create(null)

• jest-haste-map: Remove legacy condition for duplicate module detection

• jest-haste-map: Fix require detection with trailing commas and ignore import typeof modules

• jest-cli: Fix to set prettierPath via config file

• expect: Test more precisely for class instance getters

• jest-cli: Support dashed args

• jest-cli: Fix to run in band tests if watch mode enable when runInBand arg used

• jest-runtime: Fix mistake as test files when run coverage issue.

• jest-cli: Print info about passWithNoTests flag

• pretty-format: Omit unnecessary symbol filter for object keys

• jest-runtime: Fix requireActual on node_modules with mock present

• jest-resolve: Fix isBuiltinModule to support versions of node without module.builtinModules

• babel-jest: Set cwd to be resilient to it changing during the runtime of the tests

• jest-snapshot: Write and read snapshots from disk even if fs is mocked

• jest-config: Normalize config.cwd and config.rootDir using `realpath

• jest-environment-node: Fix buffer property is not ArrayBuffer issue.

• babel-plugin-jest-hoist: Ignore TS type annotations when looking for out-of-scope references

• jest-config: Add name to project if one does not exist to pick correct resolver

• jest-runtime: Pass watchPathIgnorePatterns to Haste instance

• jest-runtime: Resolve mock files via Haste when using require.resolve

Chore & Maintenance

• breaking

  *: Require Node.js 6+ for all packages

• breaking

  jest-util: Remove long-deprecated globals for fake timers

• breaking

  *: Upgrade to Micromatch 3

• breaking

  *: Remove regenerator-runtime injection

Performance

• jest-mock: Improve getType function performance.

Features

• jest-cli: Add changedSince to allowed watch mode configs

• babel-jest: Add support for babel.config.js added in Babel 7.0.0

• jest-resolve: Add support for an experimental mapper option (Watchman crawler only) that adds virtual files to the Haste map

Fixes

• jest-resolve: Only resolve realpath once in try-catch

• expect: Fix TypeError in toBeInstanceOf on null or undefined

• jest-jasmine2: Throw a descriptive error if the first argument supplied to a hook was not a function (#6917) and

• jest-circus: Throw a descriptive error if the first argument supplied to a hook was not a function (#6917) and

• expect: Fix variadic custom asymmetric matchers

• jest-cli: Fix incorrect testEnvironmentOptions warning

• jest-each: Prevent done callback being supplied to describe

• jest-config: Better error message for a case when a preset module was found, but no jest-preset.js or jest-preset.json at the root

• jest-haste-map: Catch crawler error when unsuccessfully reading directories

Performance

• jest-changed-files: Limit git and hg commands to specified roots

Fixes

• jest-circus: Fix retryTimes so errors are reset before re-running

• babel-jest: Make getCacheKey() take into account createTransformer options

• jest-jasmine2: Use prettier through require instead of localRequire. Fixes matchInlineSnapshot where prettier dependencies like path and fs are mocked with jest.mock.

• website: Fix website versions page to link to correct language

• expect: Update toContain suggestion to contain equal message

Features

• jest-haste-map: Add computeDependencies flag to avoid opening files if not needed

• jest-runtime: Support require.resolve.paths

• jest-runtime: Support paths option for require.resolve

Fixes

• jest-runner: Force parallel runs for watch mode, to avoid TTY freeze

• jest-cli: Properly reprint resolver errors in watch mode

• jest-cli: Write configuration to stdout when the option was explicitly passed to Jest

• jest-cli: Fix regression on non-matching suites (6657)

• jest-runtime: Roll back micromatch version to prevent regression when matching files

Features

• jest-each: Add support for keyPaths in test titles

• jest-cli: Add jest --init option that generates a basic configuration file with a short description for each option

• jest.retryTimes: Add jest.retryTimes() option that allows failed tests to be retried n-times when using jest-circus.

Fixes

• jest-cli: Add check to make sure one or more tests have run before notifying when using --notify

• jest-cli: Pass globalConfig as a parameter to globalSetup and globalTeardown functions

• jest-config: Add missing options to the defaults object

• expect: Using symbolic property names in arrays no longer causes the toEqual matcher to fail

• expect: toEqual no longer tries to compare non-enumerable symbolic properties, to be consistent with non-symbolic properties.

• jest-util: console.timeEnd now properly log elapsed time in milliseconds.

• jest-mock: Fix MockNativeMethods access in react-native jest.mock()

• jest-cli: Fix reporters for moduleName = 'default'

Fixes

• pretty-format: Serialize inverse asymmetric matchers correctly

Features

• expect: Expose getObjectSubset, iterableEquality, and subsetEquality

• jest-snapshot: Add snapshot property matchers

• jest-config: Support jest-preset.js files within Node modules

• jest-cli: Add --detectOpenHandles flag which enables Jest to potentially track down handles keeping it open after tests are complete.

• jest-jasmine2: Add data driven testing based on jest-each

• jest-matcher-utils: Change "suggest to equal" message to be more advisory

• jest-message-util: Don't ignore messages with vendor anymore

• jest-validate: Get rid of jest-config dependency

• jest-validate: Adds option to inject deprecationEntries

• breaking

  jest-snapshot: Concatenate name of test, optional snapshot name and count

• jest-runtime: Allow for transform plugins to skip the definition process method if createTransformer method was defined.

• expect: Add stack trace for async errors

• jest-jasmine2: Add stack trace for timeouts

• jest-jasmine2: Add stack trace for thrown non-Errors

• jest-runtime: Prevent modules from marking themselves as their own parent

• jest-mock: Add support for auto-mocking generator functions

• expect: Add support for async matchers

• expect: Suggest toContainEqual

• jest-config: Export Jest's default options

• jest-editor-support: Move coverage to ProjectWorkspace.collectCoverage

• jest-editor-support: Add coverage option to runner

• jest-haste-map: Support extracting dynamic imports

• expect: Improve output format for mismatchedArgs in mock/spy calls.

• jest-cli: Add support for using --coverage in combination with watch mode, --onlyChanged, --findRelatedTests and more

• breaking

  jest-jasmine2: Adds error throwing and descriptive errors to it/ test for invalid arguments. [jest-circus] Adds error throwing and descriptive errors to it/ test for invalid arguments

• jest-matcher-utils: Add isNot option to matcherHint function

• jest-config: Add <rootDir> to runtime files not found error report

• expect: Make toThrow matcher pass only if Error object is returned from promises

• expect: Add isError to utils

• expect: Add inverse matchers (expect.not.arrayContaining, etc., #5517)

• expect: expect.extend now also extends asymmetric matchers

• jest-mock: Update spyOnProperty to support spying on the prototype chain

• jest-mock: Add tracking of return values in the mock property

• jest-mock: Add tracking of thrown errors in the mock property

• Add nthCalledWith spy matcher

• jest-cli: Add isSerial property that runners can expose to specify that they can not run in parallel

• expect: Add .toBeCalledTimes and toHaveBeenNthCalledWith aliases

• jest-cli: Interactive Snapshot Mode improvements

• jest-editor-support: Add no-color option to runner

• jest-jasmine2: Pretty-print non-Error object errors

• jest-message-util: Include column in stack frames

• expect: Introduce toStrictEqual

• expect: Add return matchers

• jest-cli: Improve snapshot summaries

• expect: Include custom mock names in error messages

• jest-diff: Support returning diff from oneline strings

• expect: Improve return matchers

• jest-cli: Overhaul watch plugin hooks names

• breaking

  jest-mock: Include tracked call results in serialized mock

Fixes

• jest-cli: Fix stdin encoding to utf8 for watch plugins.

• expect: Better detection of DOM Nodes for equality

• jest-cli: Fix misleading action description for F key when in "only failed tests" mode.

• jest-worker: Stick calls to workers before processing them

• babel-plugin-jest-hoist: Allow using console global variable

• jest-jasmine2: Always remove node core message from assert stack traces

• expect: Add stack trace when expect.assertions and expect.hasAssertions causes test failures.

• jest-runtime: Throw a more useful error when trying to require modules after the test environment is torn down

• breaking

  jest-mock: Replace timestamps with invocationCallOrder

• jest-jasmine2: Install sourcemap-support into normal runtime to catch runtime errors

• jest-jasmine2: Added assertion error handling inside afterAll hook

• jest-cli: Remove the notifier actions in case of failure when not in watch mode.

• jest-mock: Extend .toHaveBeenCalled return message with outcome

• jest-runner: Assign process.env.JEST_WORKER_ID="1" when in runInBand mode

• jest-cli: Add descriptive error message when trying to use globalSetup/globalTeardown file that doesn't export a function.

• expect: Do not rely on instanceof RegExp, since it will not work for RegExps created inside of a different VM

• jest-resolve: Update node module resolution algorithm to correctly handle symlinked paths

• jest-editor-support: Update Settings to use spawn in shell option

• jest-cli: Improve the error message when 2 projects resolve to the same config

• jest-runtime: Remove retainLines from coverage instrumentation

• jest-cli: Fix update snapshot issue when using watchAll

• expect: Fix rejects.not matcher

• jest-runtime: Prevent Babel warnings on large files

• jest-mock: Prevent mockRejectedValue from causing unhandled rejection

• pretty-format: Handle React fragments better

• pretty-format: Handle formatting of React.forwardRef and Context components

• jest-cli: Switch collectCoverageFrom back to a string

• jest-regex-util: Fix handling regex symbols in tests path on Windows

• jest-util: Fix handling of NaN/Infinity in mock timer delay

• jest-resolve: Generalise test for package main entries equivalent to ".".

• jest-config: Ensure that custom resolvers are used when resolving the configuration

• website: Fix website docs

• expect: Fix isEqual Set and Map to compare object values and keys regardless of order

• breaking

  pretty-format: Remove undefined props from React elements

• jest-haste-map: Properly resolve mocked node modules without package.json defined

Chore & Maintenance

• breaking

  babel-jest: Always return object from transformer

• breaking

  jest-runtime: Remove jest.genMockFn and jest.genMockFunction

Fixes

• jest-haste-map: Parallelize Watchman calls in crawler

• jest-editor-support: Update TypeScript definitions

• removed

  babel-jest: Remove retainLines argument to babel.

Features

• jest-runtime: Provide require.main property set to module with test suite

Fixes

• jest-haste-map: Overhauls how Watchman crawler works fixing Windows

• expect: Allow matching of Errors against plain objects

• jest-haste-map: Do not read binary files in Haste, even when instructed to do so

• jest-cli: Don't skip matchers for exact files

• jest-runtime: Align handling of testRegex on Windows between searching for tests and instrumentation checks

• jest-config: Make it possible to merge transform option with preset

• jest-util: Fix console.assert behavior in custom & buffered consoles

Features

• deprecated

  jest-runtime: Deprecate mapCoverage option.

• babel-jest: Add option to return sourcemap from the transformer separately from source.

• jest-validate: Add ability to log deprecation warnings for CLI flags.

• jest-serializer: Added new module for serializing. Works using V8 or JSON

Fixes

• babel-jest: Revert "Remove retainLines from babel-jest"

• jest-docblock: Support multiple of the same @pragma.

Features

• jest-worker: Assign a unique id for each worker and pass it to the child process. It will be available via process.env.JEST_WORKER_ID

Features

• jest-runner: Move test summary to after coverage report

• jest-cli: Added --notifyMode to specify when to be notified.

• diff-sequences: New package compares items in two sequences to find a longest common subsequence.

• jest-matcher-utils: Add comment option to matcherHint function

• jest-config: Allow lastComit and changedFilesWithAncestor via JSON config

• jest-util: Add deletion to process.env as well

• jest-util: Add case-insensitive getters/setters to process.env

• jest-mock: Add util methods to create async functions.

Fixes

• jest-cli: Add trailing slash when checking root folder

• jest-cli: Hide interactive mode if there are no failed snapshot tests

• babel-jest: Remove retainLines from babel-jest

• jest-cli: Glob patterns ignore non-require-able files (e.g. README.md)

• jest-mock: Add backticks support (``) to mock a certain package via the __mocks__ folder.

• jest-message-util: Prevent an ENOENT crash when the test file contained a malformed source-map. (#5405).

• jest: Add import-local to jest package.

• expect: Support class instances in .toHaveProperty() and .toMatchObject matcher.

• jest-cli: Fix npm update command for snapshot summary. (#5376, 5389)

• expect: Make rejects and resolves synchronously validate its argument.

• jest-resolve: Search required modules in node_modules and then in custom paths.

• jest-resolve: Get builtin modules from node core.

• jest-resolve: Detect and preserve absolute paths in moduleDirectories. Do not generate additional (invalid) paths by prepending each ancestor of cwd to the absolute path. Additionally, this fixes functionality in Windows OS.

Features

• jest-cli: Make Jest exit without an error when no tests are found in the case of --lastCommit, --findRelatedTests, or --onlyChanged options having been passed to the CLI

• jest-cli: Add interactive snapshot mode

Fixes

• jest-cli: Use import-local to support global Jest installations.

• jest-runner: Fix memory leak in coverage reporting

• jest-cli: Fix missing newline in console message

• jest-cli: --lastCommit and --changedFilesWithAncestor now take effect even when --onlyChanged is not specified.

Fixes

• jest-cli: New line before quitting watch mode.

Features

• babel-jest: moduleFileExtensions not passed to babel transformer.

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

• 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.

• 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).

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.

• 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.

• 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.

• 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.

• 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 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.