Assertion

Filtering streams.

JavaScript Testing utilities for React

JavaScript Testing utilities for React

Disallow type assertions in TypeScript code

Type safe assertions that work just as well in production run-times as they do in testing.

Detect native Symbol.toStringTag support.

Test if a value is a string.

Test if an object has a specified property.

Detect native Symbol support.

Test if a value is a boolean.

Test if a value is object-like.

Test if a value is a Buffer object.

Test if a value is an array.

Test if a value is a function.

Return a function which tests if every element in an array passes a test condition.

Test if a value is a plain object.

Test if a value is an object.

Detect native Float64Array support.

Test if a value is a Float64Array.

Test if a value is a regular expression.

Detect native Float32Array support.

Test if a value is a Float32Array.

Test if a value is a number.

Useful utilities for working with Uint8Array (and Buffer)

Test if a double-precision floating-point numeric value is NaN.

Test if a value is a Uint8Array.

Detect native Uint32Array support.

Test if a value is a Uint32Array.

Detect native Uint8Array support.

Test if a value is a Uint16Array.

Detect native Uint16Array support.

Testing Matchers for Enzyme

Check if an environment is little endian.

Check if an environment is big endian.

Runtime Environment for enzyme tests in jest

Test if a double-precision floating-point numeric value is infinite.

Custom error types and error factory functions

Detect native Buffer support.

Add custom message to Jest expects

Type assertions aka less-broken typeof.

Extend Chai Assertion library with tests for http apis

Test if a value is a regular expression string.

Rich matchers inspired by Hamcrest. Useful for generating helpful assertion failure messages in tests.

Generic options parameter handling.

Nanoscale assertion module

Node.js test runner that lets you develop with confidence.

Exclude keys to compare from a deep equal operation with chai expect and assert

A Test-Anything-Protocol library for JavaScript

Power Assert feature enhancer for assert function/object

The powerful, easy-to-use testing framework.