jest-runner
Advanced tools
The jest-runner npm package is a custom runner for Jest that allows you to run tests with a specified test runner. It is part of the Jest ecosystem and is used to execute tests written for Jest in a customizable environment. It can be used to run tests in parallel, to specify custom test environments, and to integrate with other testing tools and frameworks.
Running tests in parallel
By default, Jest runs all tests in parallel, which can speed up the test execution time. However, if you need to run tests serially (one after another), you can use the `--runInBand` or `-i` option. This is useful when tests are not isolated and may interfere with each other when run in parallel.
jest --runInBandCustom test environments
Jest allows you to specify a custom test environment for your tests. By setting the `testEnvironment` option in your Jest configuration, you can choose the environment in which your tests will run, such as `node` for a Node.js environment or `jsdom` for a browser-like environment. The `runner` option can be set to `jest-runner` to use it as the test runner.
module.exports = {
testEnvironment: 'node',
runner: 'jest-runner'
};Integrating with other testing tools
Jest-runner can be extended to integrate with other testing tools and frameworks. For example, `jest-runner-eslint` allows you to run ESLint as a Jest test, providing a unified testing and linting workflow. You can configure Jest to use different runners for different types of tests or files, and you can also add watch plugins to enhance the developer experience during watch mode.
module.exports = {
runner: 'jest-runner-eslint',
displayName: 'lint',
testMatch: ['<rootDir>/src/**/*.js'],
watchPlugins: [
'jest-watch-typeahead/filename',
'jest-watch-typeahead/testname',
]
};Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple. It is similar to Jest in that it provides a test running environment, but it has a different API and requires manual configuration of assertion libraries, mocking, and spying tools.
Jasmine is a behavior-driven development framework for testing JavaScript code. It does not require a DOM and has a clean, obvious syntax so that you can easily write tests. It is similar to Jest but is considered less opinionated in terms of how tests are structured and executed.
AVA is a test runner for Node.js with a concise API, detailed error output, and process isolation that lets you develop with confidence. AVA is similar to Jest-runner in that it can run tests in parallel, but it emphasizes minimalism and speed, and it does not provide a built-in mocking library.
Karma is a test runner that works with any framework (such as Mocha, Jasmine, QUnit, and more), which makes it highly adaptable. It is designed to work with continuous integration tools and offers a plugin system. Unlike Jest, Karma is primarily used for running tests in actual browsers, which is useful for testing browser-specific issues.
30.0.0
[*] Renamed globalsCleanupMode to globalsCleanup and --waitNextEventLoopTurnForUnhandledRejectionEvents to --waitForUnhandledRejections[expect] Add ArrayOf asymmetric matcher for validating array elements. (#15567)[babel-jest] Add option excludeJestPreset to allow opting out of babel-preset-jest (#15164)[expect] Revert #15038 to fix expect(fn).toHaveBeenCalledWith(expect.objectContaining(...)) when there are multiple calls (#15508)[jest-circus, jest-cli, jest-config] Add waitNextEventLoopTurnForUnhandledRejectionEvents flag to minimise performance impact of correct detection of unhandled promise rejections introduced in #14315 (#14681)[jest-circus] Add a waitBeforeRetry option to jest.retryTimes (#14738)[jest-circus] Add a retryImmediately option to jest.retryTimes (#14696)[jest-circus, jest-jasmine2] Allow setupFilesAfterEnv to export an async function (#10962)[jest-circus, jest-test-result] Add startedAt timestamp in TestCaseResultObject within onTestCaseResult (#15145)[jest-cli] Export buildArgv (#15310)[jest-config] [BREAKING] Add mts and cts to default moduleFileExtensions config (#14369)[jest-config] [BREAKING] Update testMatch and testRegex default option for supporting mjs, cjs, mts, and cts (#14584)[jest-config] Loads config file from provided path in package.json (#14044)[jest-config] Allow loading jest.config.cts files (#14070)[jest-config] Show rootDir in error message when a preset fails to load (#15194)[jest-config] Support loading TS config files using esbuild-register via docblock loader (#15190)[jest-config] Allow passing TS config loader options via docblock comment (#15234)[jest-config] If Node is running with type stripping enabled, do not require a TS loader (#15480)[@jest/core] Group together open handles with the same stack trace (#13417, & #14789)[@jest/core] Add perfStats to surface test setup overhead (#14622)[@jest/core] [BREAKING] Changed --filter to accept an object with shape { filtered: Array<string> } to match documentation (#13319)[@jest/core] Support --outputFile option for --listTests (#14980)[@jest/core] Stringify Errors properly with --json flag (#15329)[@jest/core, @jest/test-sequencer] [BREAKING] Exposes globalConfig & contexts to TestSequencer (#14535, & #14543)[jest-each] Introduce %$ option to add number of the test to its title (#14710)[@jest/environment] [BREAKING] Remove deprecated jest.genMockFromModule() (#15042)[@jest/environment] [BREAKING] Remove unnecessary defensive code (#15045)[jest-environment-jsdom] [BREAKING] Upgrade JSDOM to v22 (#13825)[@jest/environment-jsdom-abstract] Introduce new package which abstracts over the jsdom environment, allowing usage of custom versions of JSDOM (#14717)[jest-environment-node] Update jest environment with dispose symbols Symbol (#14888 & #14909)[expect, @jest/expect] [BREAKING] Add type inference for function parameters in CalledWith assertions (#15129)[@jest/expect-utils] Properly compare all types of TypedArrays (#15178)[@jest/fake-timers] [BREAKING] Upgrade @sinonjs/fake-timers to v13 (#14544 & #15470)[@jest/fake-timers] Exposing new modern timers function advanceTimersToFrame() which advances all timers by the needed milliseconds to execute callbacks currently scheduled with requestAnimationFrame (#14598)[jest-matcher-utils] Add SERIALIZABLE_PROPERTIES to allow custom serialization of objects (#14893)[jest-mock] Add support for the Explicit Resource Management proposal to use the using keyword with jest.spyOn(object, methodName) (#14895)[jest-reporters] Add support for DEC mode 2026 (#15008)[jest-resolver] Support file:// URLs as paths (#15154)[jest-resolve,jest-runtime,jest-resolve-dependencies] Pass the conditions when resolving stub modules (#15489)[jest-runtime] Exposing new modern timers function jest.advanceTimersToFrame() from @jest/fake-timers (#14598)[jest-runtime] Support import.meta.filename and import.meta.dirname (available from Node 20.11) (#14854)[jest-runtime] Support import.meta.resolve (#14930)[jest-runtime] [BREAKING] Make it mandatory to pass globalConfig to the Runtime constructor (#15044)[jest-runtime] Add unstable_unmockModule (#15080)[jest-runtime] Add onGenerateMock transformer callback for auto generated callbacks (#15433 & #15482)[jest-runtime] [BREAKING] Use vm.compileFunction over vm.Script (#15461)[@jest/schemas] Upgrade @sinclair/typebox to v0.34 (#15450)[@jest/types] test.each(): Accept a readonly (as const) table properly (#14565)[@jest/types] Improve argument type inference passed to test and describe callback functions from each tables (#14920)[jest-snapshot] [BREAKING] Add support for Error causes in snapshots (#13965)[jest-snapshot] Support Prettier 3 (#14566)[@jest/util-snapshot] Extract utils used by tooling from jest-snapshot into its own package (#15095)[pretty-format] [BREAKING] Do not render empty string children ('') in React plugin (#14470)[expect] Show AggregateError to display (#15346)[*] Replace exit with exit-x (#15399)[babel-plugin-jest-hoist] Use denylist instead of the deprecated blacklist for Babel 8 support (#14109)[babel-plugin-jest-hoist] Do not rely on buggy Babel behaviour (#15415)[expect] Check error instance type for toThrow/toThrowError (#14576)[expect] Improve diff for failing expect.objectContaining (#15038)[expect] Use Array.isArray to check if an array is an Array (#15101)[expect] Fix Error cause assertion errors (#15339)[jest-changed-files] Print underlying errors when VCS commands fail (#15052)[jest-changed-files] Abort sl root call if output resembles a steam locomotive (#15053)[jest-circus] [BREAKING] Prevent false test failures caused by promise rejections handled asynchronously (#14315)[jest-circus] Replace recursive makeTestResults implementation with iterative one (#14760)[jest-circus] Omit expect.hasAssertions() errors if a test already has errors (#14866)[jest-circus, jest-expect, jest-snapshot] Pass test.failing tests when containing failing snapshot matchers (#14313)[jest-circus] Concurrent tests now emit jest circus events at the correct point and in the expected order. (#15381)[jest-cli] [BREAKING] Validate CLI flags that require arguments receives them (#14783)[jest-config] Make sure to respect runInBand option (#14578)[jest-config] Support testTimeout in project config (#14697)[jest-config] Support coverageReporters in project config (#14697)[jest-config] Allow reporters in project config (#14768)[jest-config] Allow Node16/NodeNext/Bundler moduleResolution in project's tsconfig (#14739)[@jest/create-cache-key-function] Correct the return type of createCacheKey (#15159)[jest-each] Allow $keypath templates with null or undefined values (#14831)[@jest/expect-utils] Fix comparison of DataView (#14408)[@jest/expect-utils] [BREAKING] exclude non-enumerable in object matching (#14670)[@jest/expect-utils] Fix comparison of URL (#14672)[@jest/expect-utils] Check Symbol properties in equality (#14688)[@jest/expect-utils] Catch circular references within arrays when matching objects (#14894)[@jest/expect-utils] Fix not addressing to Sets and Maps as objects without keys (#14873)[jest-haste-map] Fix errors or clobbering with multiple hasteImplModulePaths (#15522)[jest-leak-detector] Make leak-detector more aggressive when running GC (#14526)[jest-runtime] Properly handle re-exported native modules in ESM via CJS (#14589)[jest-runtime] Refactor _importCoreModel so required core module is consistent if modified while loading (#15077)[jest-schemas, jest-types] [BREAKING] Fix type of testFailureExitCode config option(#15232)[jest-util] Make sure isInteractive works in a browser (#14552)[pretty-format] [BREAKING] Print ArrayBuffer and DataView correctly (#14290)[pretty-format] Fixed a bug where "anonymous custom elements" were not being printed as expected. (#15138)[jest-cli] When specifying paths on the command line, only match against the relative paths of the test files (#12519)
testPathPattern configuration option to testPathPatterns, which now takes a list of patterns instead of the regex.--testPathPattern is now --testPathPatternstestPathPatterns when programmatically calling watch must be specified as new TestPathPatterns(patterns), where TestPathPatterns can be imported from @jest/pattern[jest-reporters, jest-runner] Unhandled errors without stack get correctly logged to console (#14619)[jest-util] Always load mjs files with import (#15447)[jest-worker] Properly handle a circular reference error when worker tries to send an assertion fails where either the expected or actual value is circular (#15191)[jest-worker] Properly handle a BigInt when worker tries to send an assertion fails where either the expected or actual value is BigInt (#15191)[expect] Resolve issue where ObjectContaining matched non-object values. #15463.
conditional/check to ensure the argument passed to expect is an object.ObjectContaining behavior.invalid/wrong test case assertions for ObjectContaining.[jest-worker] Addresses incorrect state on exit (#15610)[*] [BREAKING] Bundle all of Jest's modules into index.js (#12348, #14550 & #14661)[jest-haste-map] Only spawn one process to check for watchman installation (#14826)[jest-runner] Better cleanup source-map-support after test to resolve (minor) memory leak (#15233)[jest-circus, jest-environment-node, jest-repl, jest-runner, jest-util] Cleanup global variables on environment teardown to reduce memory leaks (#15215 & #15636 & #15643)[jest-environment-jsdom, jest-environment-jsdom-abstract] Increased version of jsdom to ^26.0.0 (#15325CVE-2024-37890)[*] Increase version of micromatch to ^4.0.7 (#15082)[*] [BREAKING] Drop support for Node.js versions 14, 16, 19, 21 and 23 (#14460, #15118, #15623, #15640)[*] [BREAKING] Drop support for typescript@4.3, minimum version is now 5.4 (#14542, #15621)[*] Depend on exact versions of monorepo dependencies instead of ^ range (#14553)[*] [BREAKING] Add ESM wrapper for all of Jest's modules (#14661)[*] [BREAKING] Upgrade to glob@10 (#14509)[*] Use TypeError over Error where appropriate (#14799)[docs] Fix typos in CHANGELOG.md and packages/jest-validate/README.md (#14640)[docs] Don't use alias matchers in docs (#14631)[babel-jest, babel-preset-jest] [BREAKING] Increase peer dependency of @babel/core to ^7.11 (#14109)[babel-jest, @jest/transform] Update babel-plugin-istanbul to v6 (#15156)[babel-plugin-jest-hoist] Move unnecessary dependencies to devDependencies (#15010)[expect] [BREAKING] Remove .toBeCalled(), .toBeCalledTimes(), .toBeCalledWith(), .lastCalledWith(), .nthCalledWith(), .toReturn(), .toReturnTimes(), .toReturnWith(), .lastReturnedWith(), .nthReturnedWith() and .toThrowError() matcher aliases (#14632)[jest-cli, jest-config, @jest/types] [BREAKING] Remove deprecated --init argument (#14490)[jest-config, @jest/core, jest-util] Upgrade ci-info (#14655)[jest-mock] [BREAKING] Remove MockFunctionMetadataType, MockFunctionMetadata and SpyInstance types (#14621)[@jest/reporters] Upgrade istanbul-lib-source-maps (#14924)[jest-schemas] Upgrade @sinclair/typebox (#14775)[jest-transform] Upgrade write-file-atomic (#14274)[jest-util] Upgrade picomatch to v4 (#14653 & #14885)[docs] Append to NODE_OPTIONS, not overwrite ([#14730](https://github.com/jestjs/jest/pull/14730))[docs] Updated .toHaveBeenCalled() documentation to correctly reflect its functionality (#14842)[docs] Link NestJS documentation on testing with Jest (#14940)[docs] Revised documentation for .toHaveBeenCalled() to accurately depict its functionality. (#14853)[docs] Removed ExpressJS reference link from documentation due to dead link (#15270)[docs] Correct broken links in docs (#15359)FAQs
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The npm package jest-runner receives a total of 27,676,753 weekly downloads. As such, jest-runner popularity was classified as popular.
We found that jest-runner demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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