Assertion

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

Assertion Library for Browser and Node.JS

Format errors to display a diff between the actual and expected

Allow parsing of the module assertion attributes in the import statement

Support for import assertions in acorn

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

Validate XML, Parse XML, Build XML without C/C++ based libraries

Type check values

Extra assertions on top of node's assert module

minimalistic-assert ===

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

A tiny invariant function

String validation and sanitization

The assert module from Node.js, for the browser.

simple, flexible, fun test framework

Lazy assertions without performance penalty

JavaScript test spies, stubs and mocks.

flow typed nullthrows

Featherweight assert module

TypeScript implementation of invariant(condition, message)

Do things in development and nothing otherwise

A little library for asserting types and values, with zero dependencies.

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typesafe assertion library for TypeScript 3.7+

uvu is an extremely fast and lightweight test runner for Node.js and the browser

assert with status codes

Yet another JavaScript assertion/invariant library.

assertion renderer for power-assert context

Adaptation of react-addons-shallow-compare, for independent usage

A simple and composable way to validate data in JavaScript (and TypeScript).

test framework agnostic BDD-style assertions

Common assertion tools used in ot-node and dkg.js

TypeScript definitions for http-assert

JavaScript Testing utilities for React

Additional Jest matchers

Next-gen browser and mobile automation test framework for Node.js

Helper function for exhaustive checks of discriminated unions in TypeScript

Type assertions aka less-broken `typeof`

Hook and modify stdout and stderr

Extends Chai with assertions about promises.

Helpers for asserting that a JavaScript environment supports certain features necessary for the operation of the Solana JavaScript SDK

Useful utilities for working with Uint8Array (and Buffer)

JavaScript Testing utilities for React

Check two valid geojson geometries for equality.

JavaScript Testing utilities for React

WebdriverIO Assertion Library

Function argument validation for humans

Extends Chai with assertions for the Sinon.JS mocking framework.

Disallow type assertions in TypeScript code

Better assertions for node, reporting the expr, filename, lineno etc