MCPInstall

csharp-nunit

by github OfficialTesting & QA

Get best practices for NUnit unit testing, including data-driven tests

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/github/awesome-copilot --skill csharp-nunit
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads csharp-nunit automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

Security audits

Independent scans of the skill's instructions and bundled files.

Gen Agent Trust Hub PassSAFE ·This skill provides best practices and guidelines for using the NUnit testing framework in C#. It covers project setup, test structure, assertions, and mocking using industry-standard tools and libraries. No security issues were detected.
Socket PassNo alerts
Snyk PassLOW ·Risk: LOW · No issues
Runlayer WarnMEDIUM ·1/1 file flagged
ZeroLeaks PassNONE ·Score: 93/100 · 2 sections analyzed

SKILL.md

The instructions your agent reads when the skill is triggered.

NUnit Best Practices

Your goal is to help me write effective unit tests with NUnit, covering both standard and data-driven testing approaches.

Project Setup

  • Use a separate test project with naming convention [ProjectName].Tests
  • Reference Microsoft.NET.Test.Sdk, NUnit, and NUnit3TestAdapter packages
  • Create test classes that match the classes being tested (e.g., CalculatorTests for Calculator)
  • Use .NET SDK test commands: dotnet test for running tests

Test Structure

  • Apply [TestFixture] attribute to test classes
  • Use [Test] attribute for test methods
  • Follow the Arrange-Act-Assert (AAA) pattern
  • Name tests using the pattern MethodName_Scenario_ExpectedBehavior
  • Use [SetUp] and [TearDown] for per-test setup and teardown
  • Use [OneTimeSetUp] and [OneTimeTearDown] for per-class setup and teardown
  • Use [SetUpFixture] for assembly-level setup and teardown

Standard Tests

  • Keep tests focused on a single behavior
  • Avoid testing multiple behaviors in one test method
  • Use clear assertions that express intent
  • Include only the assertions needed to verify the test case
  • Make tests independent and idempotent (can run in any order)
  • Avoid test interdependencies

Data-Driven Tests

  • Use [TestCase] for inline test data
  • Use [TestCaseSource] for programmatically generated test data
  • Use [Values] for simple parameter combinations
  • Use [ValueSource] for property or method-based data sources
  • Use [Random] for random numeric test values
  • Use [Range] for sequential numeric test values
  • Use [Combinatorial] or [Pairwise] for combining multiple parameters

Assertions

  • Use Assert.That with constraint model (preferred NUnit style)
  • Use constraints like Is.EqualTo, Is.SameAs, Contains.Item
  • Use Assert.AreEqual for simple value equality (classic style)
  • Use CollectionAssert for collection comparisons
  • Use StringAssert for string-specific assertions
  • Use Assert.Throws<T> or Assert.ThrowsAsync<T> to test exceptions
  • Use descriptive messages in assertions for clarity on failure

Mocking and Isolation

  • Consider using Moq or NSubstitute alongside NUnit
  • Mock dependencies to isolate units under test
  • Use interfaces to facilitate mocking
  • Consider using a DI container for complex test setups

Test Organization

  • Group tests by feature or component
  • Use categories with [Category("CategoryName")]
  • Use [Order] to control test execution order when necessary
  • Use [Author("DeveloperName")] to indicate ownership
  • Use [Description] to provide additional test information
  • Consider [Explicit] for tests that shouldn't run automatically
  • Use [Ignore("Reason")] to temporarily skip tests

FAQ

What does the csharp-nunit skill do?

Get best practices for NUnit unit testing, including data-driven tests

How do I install csharp-nunit?

Run npx skills add https://github.com/github/awesome-copilot --skill csharp-nunit in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/csharp-nunit/ (personal) or .claude/skills/csharp-nunit/ (project).

Which AI agents can use csharp-nunit?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is csharp-nunit safe to install?

Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer flagged items to review; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.

Who maintains csharp-nunit?

It is published by github in github/awesome-copilot, and it is an official skill from the maker of the technology it covers. It has 8,960 recorded installs.

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