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Changelog

jest 19.0.0

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