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jest-runtime

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jest-runtime


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What is jest-runtime?

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.

What are jest-runtime's main functionalities?

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);

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Package last updated on 12 Sep 2023

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