jest-util
Advanced tools
Package description
The jest-util package provides utility functions for Jest, a popular JavaScript testing framework. It includes a variety of helpers and tools that are used internally by Jest but can also be useful for developers working with or extending Jest tests.
Console Replacement
This feature allows for the creation of a custom console that buffers all logs. This is useful for controlling and testing console output during test runs.
const { BufferedConsole } = require('jest-util');
const customConsole = new BufferedConsole();
customConsole.log('Hello, this is a buffered log.');Error Formatting
This function formats execution errors for display in Jest's output, providing a standardized view of test errors, including stack traces.
const { formatExecError } = require('jest-util');
const error = new Error('Test error');
const config = {rootDir: '/path/to/project', testMatch: []};
console.log(formatExecError(error, config, {noStackTrace: false}, undefined, true));Test Path Normalization
This utility normalizes file paths for glob matching, which is particularly useful on Windows where path separators differ.
const { replacePathSepForGlob } = require('jest-util');
const path = 'path\to\test\file.js';
console.log(replacePathSepForGlob(path));Chai is an assertion library similar to jest-util in that it is used to help with testing JavaScript applications. Unlike jest-util, Chai focuses more on providing a rich set of assertions rather than utilities for managing Jest environments or outputs.
Mocha is a test framework that, like Jest, can utilize utility packages for enhanced testing capabilities. While jest-util specifically supports Jest, Mocha has its own set of utilities and plugins that serve a similar purpose but are tailored to Mocha's ecosystem.
Sinon provides standalone test spies, stubs, and mocks for JavaScript. It complements jest-util by offering more focused functionalities for creating and managing test doubles, which can be used alongside or independently of Jest.
Changelog
25.5.0
[@jest/globals] New package so Jest's globals can be explicitly imported (#9801)[jest-core] Show coverage of sources related to tests in changed files (#9769)[jest-runtime] Populate require.cache (#9841)[*] Use graceful-fs directly in every package instead of relying on fs being monkey patched (#9443)[expect] Prints the Symbol name into the error message with a custom asymmetric matcher (#9888)[jest-circus, jest-jasmine2] Support older version of jest-runtime (#9903 & #9842)[@jest/environment] Make sure not to reference Jest types (#9875)[jest-message-util] Code frame printing should respect --noStackTrace flag (#9866)[jest-runtime] Support importing CJS from ESM using import statements (#9850)[jest-runtime] Support importing parallel dynamic imports (#9858)[jest-transform] Improve source map handling when instrumenting transformed code (#9811)[docs] Add an example for mocking non-default export class[jest-resolve] Update resolve to a version using native realpath, which is faster than the default JS implementation (#9872)[jest-resolve] Pass custom cached realpath function to resolve (#9873)[jest-runtime] Add teardown method to clear any caches when tests complete (#9906)[jest-runtime] Do not pass files required internally through transformation when loading them (#9900)[jest-runtime] Use Maps instead of object literals as cache holders (#9901)FAQs
This packages is a collection of utilities and helper functions
The npm package jest-util receives a total of 33,480,357 weekly downloads. As such, jest-util popularity was classified as popular.
We found that jest-util 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.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
In the latest Risky Biz Podcast episode, Socket CEO Feross Aboukhadijeh discussed the limitations of the National Vulnerability Database (NVD) in addressing the modern risks associated with using open source package registries.
Security News
Come meet the Socket team at BlackHat and DEF CON! We're sponsoring some fun networking events and we would love to see you there.
Security News
Learn how Socket's 'Non-Existent Author' alert helps safeguard your dependencies by identifying npm packages published by deleted accounts. This is one of the fastest ways to determine if a package may be abandoned.