jest-util

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