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NUnit — express expected .NET behavior with test attributes and assertions

OSS scale score 258.2OSS health 85Update pace 26 commits/30d
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Stars
2,627
Primary language
C#
License
MIT
Repository last updated
Sep 20, 2026

Overview

NUnit is a testing framework for .NET languages including C#. Tests are defined with attributes and verified with assertions and constraints, covering use cases from unit testing to integration and system tests.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Express test cases with attributes and assertions

Attributes such as [Test] identify tests, while a broad assertion and constraint model expresses expected behavior.

Sources: [2][3]

Combine the framework with dotnet test and IDE adapters

The Framework is separate from Visual Studio Adapter and Console/Engine repositories, allowing projects to choose the runner integration they need.

Sources: [2]

For a shared .NET testing model from TDD to integration tests

It fits teams that want consistent fixtures, assertions, and test conventions across a .NET codebase.

Sources: [2]

Review breaking changes when moving from NUnit 3 or 4 to 5

The README identifies NUnit 5 as the current generation and directs users through documented breaking changes and migration guidance for earlier test suites.

Sources: [2][3]

Official sources

  1. [1]nunit/nunit repository(2026-09-21)
  2. [2]NUnit README(2026-09-21)
  3. [3]NUnit documentation(2026-09-21)
  4. [4]NUnit MIT license(2026-09-21)
Supplemental curator note

This repository is the NUnit Framework used to write tests. Visual Studio/dotnet test adapters, analyzers, and Console/Engine tooling are maintained in separate repositories. The README identifies NUnit 5 as the current generation and points users upgrading from NUnit 3 or 4 to breaking-change and migration guidance.

Try it in 3 steps

  1. 1

    Create an NUnit test project

    Use the .NET CLI template documented by the official NUnit installation guide.

    dotnet new nunit -o TestProject1
  2. 2

    Inspect the generated test

    Review the generated [Test] example and adjust its assertion for the behavior you want to verify.

    Open TestProject1/UnitTest1.cs
  3. 3

    Run it with dotnet test

    Execute the tests through the adapter included by the template and inspect the result.

    dotnet test TestProject1
Check the official README

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2,627 Stars

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Development activity

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Commits (last 30 days)
26
Open PRs
10

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GitHub data

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GitHub Topics

  • nunit-framework
  • tdd
  • testing
  • test-framework
  • test-driven-development
  • dotnet
  • c-sharp
  • nunit
  • hacktoberfest
Stars
2,627
Forks
766
Watchers
111
Open issues
254
Contributors
232
Primary language
C#
License
MIT
Repository last updated
Sep 20, 2026
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