Testing

Simple asynchronous testing framework. Never again count your asserts! This tiny testing library is fully callback-based and has a rich API for asserts.

Simple and complete DOM testing utilities that encourage good testing practices.

Custom jest matchers to test the state of the DOM

Simple and complete React DOM testing utilities that encourage good testing practices.

Fire events the same way the user does

Regular expression for matching ANSI escape codes

Get the first fulfilled promise that satisfies the provided testing function

Get the native type of a value.

Stub TypeScript definitions entry for @testing-library/jest-dom, which provides its own types definitions

Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js

ESLint plugin to follow best practices and anticipate common mistakes when writing tests with Testing Library

Regular expression for matching a shebang line

Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

Match balanced character pairs, like "{" and "}"

Get details about the current Continuous Integration environment

Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a bet

Nest - modern, fast, powerful node.js web framework (@testing)

Simple and complete React hooks testing utilities that encourage good testing practices.

Returns true if a string has an extglob.

Returns true if a value is a plain object, array or function.

Check if a value is a plain object

Give a regex, get a robust predicate function that tests it against a string.

test for inclusion or exclusion of paths using globs

Instrumented version of Testing Library for Storybook Interactions

Delightful JavaScript Testing.

HTTP response freshness testing

Simple and complete custom Cypress commands and utilities that encourage good testing practices.

Delightful JavaScript Testing.

Parameterised tests for Jest

Delightful JavaScript Testing.

Type check values

Delightful JavaScript Testing.

Check if a value is an object

Accessibility engine for automated Web UI testing

BDD/TDD assertion library for node.js and the browser. Test framework agnostic.

A response-like object for mocking a Node.js HTTP response stream

In-memory file-system with Node's fs API.

Error constructor for test and validation frameworks that implements standardized AssertionError specification.

A well-tested CSS minifier

unist utility to check if a node passes a test

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript

Detect if the current environment is a CI server

Simple and complete React Native testing utilities that encourage good testing practices.

string-argv parses a string into an argument array to mimic process.argv. This is useful when testing Command Line Utilities that you want to pass arguments to.

invariant

Create a javascript regular expression for matching everything except for the given string.

Generate a regex from a string or array of strings.