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jest-util
Advanced tools
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.
jest 16.0.0
jest <pattern>
is now case-insensitive.it.only
, it.skip
, test.only
, test.skip
and xtest
.--testNamePattern=pattern
or -t <pattern>
to run individual tests in test files.a
, o
, p
, q
or enter
while tests are running in the watch mode, the test run will be interrupted.--bail
now works together with --watch
.test.concurrent
for concurrent async tests..jsx
extension.jest.clearAllMocks
to clear all mocks manually.jest-snapshot
can now be more easily integrated into other test runners and used in other projects.fit
or when an error is thrown in a test.toHaveBeenLastCalledWith
, toHaveBeenCalledWith
, lastCalledWith
and toBeCalledWith
failure messages.toBeInstanceOf
matcher.toContainEqual
matcher.toThrowErrorMatchingSnapshot
matcher.moduleNameMapper
resolution.setupTestFrameworkScriptFile
script to make it easier to use chai together with Jest.--findRelatedTests <fileA> <fileB>
cli option to run tests related to the specified files.jest.deepUnmock
to babel-plugin-jest-hoist
.jest.runTimersToTime
which is useful together with fake timers.FAQs
This packages is a collection of utilities and helper functions
The npm package jest-util receives a total of 42,987,179 weekly downloads. As such, jest-util popularity was classified as popular.
We found that jest-util 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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