NUnit vs Pest

NUnit is a unit-testing framework for .NET languages, with supported languages listed as C#, VB.NET, F#, and C++. NUnit 3 and later releases use the MIT license, which permits free use in commercial and noncommercial applications and libraries. NUnit 5 adds attributes for declaring dependencies between tests and fixtures. Its Repeat feature can set a required pass percentage from 1 to 100 and optionally stop once the outcome is determined. NUnit 5 ships builds targeting net462, net8.0, and net10.0. Installation options include project templates for Visual Studio, Visual Studio Code, and Rider, along with the dotnet new nunit command; release packages are available through NuGet and GitHub. The Visual Studio template references the NUnit Test Adapter, NUnit Analyzer, Microsoft Test SDK, and coverlet code coverage package. Documentation describes automated runs on clean machines, including Azure DevOps and GitHub Actions build agents. The project is supported by the .NET Foundation and maintained by a core team and community contributors.

Pest is a free PHP testing framework for developers and AI agents, installed in a PHP project as a Composer development dependency. Pest 5 requires PHP 8.4 or later. It supports parallel execution, coverage, mutation and snapshot testing, profiling, architectural testing and browser testing. Its Browser plugin uses Playwright for page interactions, while the Agent plugin lets coding agents run one-off application checks and can drive a real browser when the Browser plugin is installed. Pest Evals combines deterministic tests with AI-powered scorers for evaluating LLM output. The Tia Engine reruns tests affected by recent changes and requires PCOV or Xdebug as a coverage driver. Pest 5 includes PHPStan and Rector plugins; team-maintained plugins include Faker, Laravel and Livewire. JetBrains maintains the PhpStorm plugin, included by default since version 2023.3. Pest supports parameterized cases but does not include built-in mocks. Its maintainers say bug fixes for outdated major versions are available for 12 months after the latest version's release, without a guaranteed resolution time or fix for every issue.