babel-jest

Added a version for snapshots.

Removed the mocksPattern configuration option, it never worked correctly.

Renamed testPathDirs to roots to avoid confusion when configuring Jest.

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

Updated snapshot format to properly escape data.

Fixed --color to be recognized correctly again.

Fixed babel-plugin-jest-hoist to work properly with type annotations in tests.

Fixed behavior for console.log calls and fixed a memory leak (#2539).

Fixed cache directory path for Jest to avoid ENAMETOOLONG errors.

Fixed change events to be emitted in jest-haste-map's watch mode. This fixes issues with Jest's new watch mode and react-native-packager.

Fixed cli arguments to be used when loading the config from file, they were previously ignored.

Fixed Jest to load json files that include a BOM.

Fixed Jest to throw errors instead of ignoring invalid cli options.

Fixed mocking behavior for virtual modules.

Fixed mocking behavior with transitive dependencies.

Fixed support for asymmetric matchers in toMatchObject.

Fixed test interruption and --bail behavior.

Fixed watch mode to clean up worker processes when a test run gets interrupted.

Fixed whitespace to be highlighted in snapshots and assertion errors.

Improved babel-jest plugin: babel is loaded lazily, istanbul comments are only added when coverage is used.

Improved error for invalid transform config.

Improved moduleNameMapper to not overwrite mocks when many patterns map to the same file.

Improved printing of skipped tests in verbose mode.

Improved resolution code in jest-resolve.

Improved to only show patch marks in assertion errors when the comparison results in large objects.

New --collectCoverageFrom cli argument.

New --coverageDirectory cli argument.

New expect.addSnapshotSerializer to add custom snapshot serializers for tests.

New jest.spyOn.

New testMatch configuration option that accepts glob patterns.

New eslint-plugin-jest with no-disabled-tests, no-focuses-tests and no-identical-title rules and default configuration and globals.

New expect.stringContaining asymmetric matcher.

New feature to make manual mocks with nested folders work. For example __mocks__/react-native/Library/Text.js will now work as expected.

New feature to re-run tests through the notification when using --notify.

New jest-phabricator package to integrate Jest code coverage in phabriactor.

New jest-validate package to improve configuration errors, help with suggestions of correct configuration and to be adopted in other libraries.

New pretty-printing for asymmetric matchers.

New RSS feed for Jest's blog.

New way to provide a reducer to extract haste module ids.

New website, new documentation, new color scheme and new homepage.

Rewritten watch mode for instant feedback, better code quality and to build new features on top of it (#2362).