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jest-runtime
Advanced tools
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.
FAQs
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The npm package jest-runtime receives a total of 19,004,198 weekly downloads. As such, jest-runtime popularity was classified as popular.
We found that jest-runtime demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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