jest-runtime
Advanced tools
Package description
The jest-runtime package is part of the Jest testing platform. It is responsible for executing tests and their associated code within a controlled environment. It handles the evaluation of the test files, mocking of modules, and provides utilities for loading and running the tests.
Module Mocking
Allows you to mock modules to isolate your tests from their dependencies, providing a way to test modules in isolation.
jest.mock('moduleName');Test Environment Setup
Enables you to programmatically create a test environment, including the haste map (module map) and the test runner, which can be used to execute test files.
const runtime = require('jest-runtime');
// Create a runtime to execute the test
runtime.createHasteMap(config).then(hasteMap => {
const environment = new runtime.TestEnvironment(config);
const runner = new runtime.TestRunner(environment, hasteMap.resolver);
// Execute the test file
runner.runTest(filePath);
});Script Transformation
Provides the ability to transform scripts using Jest's built-in transformers or custom ones. This is useful for preprocessing files before they are executed in the test environment.
const runtime = require('jest-runtime');
// Create a new runtime instance
const jestRuntime = new runtime.ScriptTransformer(config);
// Transform a script
const transformedCode = jestRuntime.transformSource(filePath, fileContent, false);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-runtime in that it provides a test environment and runner, but it does not include a built-in mocking library or script transformation capabilities.
Jasmine is a behavior-driven development framework for testing JavaScript code. It does not require a DOM, and it has a clean, obvious syntax so that you can easily write tests. It is similar to jest-runtime in providing an environment for running tests, but it has a different assertion library and does not handle module mocking and script transformation in the same way.
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-runtime in that it can run tests in parallel and supports the latest JavaScript features, but it differs in its approach to mocking and does not provide a built-in mechanism for script transformation.
Changelog
29.6.0
[jest-circus, jest-snapshot] Add support for snapshot matchers in concurrent tests (#14139)[jest-cli] Include type definitions to generated config files (#14078)[jest-snapshot] Support arrays as property matchers (#14025)[jest-core, jest-circus, jest-reporter, jest-runner] Added support for reporting about start individual test cases using jest-circus (#14174)[jest-circus] Prevent false test failures caused by promise rejections handled asynchronously (#14110)[jest-config] Handle frozen config object (#14054)[jest-config] Allow coverageDirectory and collectCoverageFrom in project config (#14180)[jest-core] Always use workers in watch mode to avoid crashes (#14059).[jest-environment-jsdom, jest-environment-node] Fix assignment of customExportConditions via testEnvironmentOptions when custom env subclass defines a default value (#13989)[jest-matcher-utils] Fix copying value of inherited getters (#14007)[jest-mock] Tweak typings to allow jest.replaceProperty() replace methods (#14008)[jest-mock] Improve user input validation and error messages of spyOn and replaceProperty methods (#14087)[jest-runtime] Bind jest.isolateModulesAsync to this (#14083)[jest-runtime] Forward wrapperLength to the Script constructor as columnOffset for accurate debugging (#14148)[jest-runtime] Guard _isMockFunction access with in (#14188)[jest-snapshot] Fix a potential bug when not using prettier and improve performance (#14036)[@jest/transform] Do not instrument .json modules (#14048)[jest-worker] Restart a shut down worker before sending it a task (#14015)[*] Update semver dependency to get vulnerability fix (#14262)[docs] Updated documentation for the --runTestsByPath CLI command (#14004)[docs] Updated documentation regarding the synchronous fallback when asynchronous code transforms are unavailable (#14056)[docs] Update jest statistics of use and downloads in website Index.FAQs
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The npm package jest-runtime receives a total of 17,424,895 weekly downloads. As such, jest-runtime popularity was classified as popular.
We found that jest-runtime demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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