JavaScript Testing utilities for React

AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.

Verify is a snapshot testing tool that simplifies the assertion of complex data models and documents.

Fluent testing library for ASP.NET Core MVC.

Fluent testing framework for ASP.NET Web API 2.

A multiplatform expectation library for Kotlin

Assertive programming for R analysis pipelines

A pytest plugin that allows multiple failures per test.

Rust testing library

Power Assert in Elixir. Shows evaluation results each expression.

A Go test assertion library for verifying that two representations of JSON are semantically equal

Behavior-oriented, expressive, human-friendly Python assertion library for the 21st century

Bringing Jest-esque Snapshot testing to C#

Fluent assertion-style functions used by goconvey and gunit. Can also be used in any test or application.

Fluent assertions for Python

WebdriverIO Assertion Library

Automatic and modern error handling package for Go

Lightweight Self-Documenting Design by Contract Programming and Security Hardened mode.

Fluent test assertions for Rust.

Matchers for JDK 8 Optional

A header-only C++ library for system-level verification and declarative testing of real-time systems with Python bindings.

A comprehensive set of matcher-based assertions for easier testing of Rust code

Delayed aka. Soft assert for python

Library for simplifying data verification in functional tests for your JSON-based APIs

A complement to Pharo & GS64 adding useful extensions

An AX-first (AI/Agent Experience) Kotlin multiplatform testing library with power-assert compatible assertions DSL and other testing goodies.

Simple, light-weight assertions framework for javascript

🚀 C header-only formattable assert macros library

HTTP assertion plugin for grappa

A simple and elegant assertion library for input validation.