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jest-runner
Advanced tools
Package description
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 --runInBand
Custom 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.
Changelog
29.5.0
[jest-changed-files]
Support Sapling (#13941)[jest-circus, @jest/cli, jest-config]
Add feature to randomize order of tests via CLI flag or through the config file(#12922)[jest-cli, jest-config, @jest/core, jest-haste-map, @jest/reporters, jest-runner, jest-runtime, @jest/types]
Add workerThreads
configuration option to allow using worker threads for parallelization (#13939)[jest-cli]
Export yargsOptions
(#13970)[jest-config]
Add openHandlesTimeout
option to configure possible open handles warning. (#13875)[@jest/create-cache-key-function]
Allow passing length
argument to createCacheKey()
function and set its default value to 16
on Windows (#13827)[jest-message-util]
Add support for AggregateError (#13946 & #13947)[jest-message-util]
Add support for Error causes in test
and it
(#13935 & #13966)[jest-reporters]
Add summaryThreshold
option to summary reporter to allow overriding the internal threshold that is used to print the summary of all failed tests when the number of test suites surpasses it (#13895)[jest-runtime]
Expose @sinonjs/fake-timers
async APIs functions advanceTimersByTimeAsync(msToRun)
(tickAsync(msToRun)
), advanceTimersToNextTimerAsync(steps)
(nextAsync
), runAllTimersAsync
(runAllAsync
), and runOnlyPendingTimersAsync
(runToLastAsync
) (#13981)[jest-runtime, @jest/transform]
Allow V8 coverage provider to collect coverage from files which were not loaded explicitly (#13974)[jest-snapshot]
Add support to cts
and mts
TypeScript files to inline snapshots (#13975)[jest-worker]
Add start
method to worker farms (#13937)[jest-worker]
Support passing a URL as path to worker (#13982)[babel-plugin-jest-hoist]
Fix unwanted hoisting of nested jest
usages (#13952)[jest-circus]
Send test case results for todo
tests (#13915)[jest-circus]
Update message printed on test timeout (#13830)[jest-circus]
Avoid creating the word "testfalse" when takesDoneCallback
is false
in the message printed on test timeout AND updated timeouts test (#13954)[jest-environment-jsdom]
Stop setting document
to null
on teardown (#13972)[@jest/expect-utils]
Update toStrictEqual()
to be able to check jest.fn().mock.calls
(#13960)[@jest/test-result]
Allow TestResultsProcessor
type to return a Promise (#13950)[jest-snapshot]
Remove dependency on jest-haste-map
(#13977)FAQs
Unknown package
The npm package jest-runner receives a total of 18,796,407 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 6 open source maintainers collaborating on the project.
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