RSpec

pytest

pytest-dev/pytest

Popular

De facto Python testing framework with plain asserts, powerful fixtures and 1,000+ plugins.

JUnit

junit-team/junit-framework

Popular

Standard Java testing framework; JUnit 6 unified versioning and requires Java 17+.

xUnit.net

xunit/xunit

Popular

Modern, community-focused unit testing framework for .NET and the default in many new C# projects.

NUnit

nunit/nunit

Mature, attribute-driven .NET unit testing framework with rich assertions and parameterized tests.

MSTest

microsoft/testfx

Microsoft's .NET test framework, modernized with the lightweight Microsoft.Testing.Platform runner.

testify

stretchr/testify

Popular

Most popular Go testing toolkit adding assertions, mocks and suites on top of the standard testing package.

PHPUnit

sebastianbergmann/phpunit

Popular

Standard xUnit-style testing framework for PHP, underpinning Laravel, Symfony and most PHP projects.

Pest

pestphp/pest

Rising

Elegant PHP testing framework built on PHPUnit with a Jest-like API; the default for new Laravel apps.

GoogleTest

google/googletest

Popular

Google's C++ testing and mocking framework (gtest/gmock), the most common choice for C++ projects.