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C# XUnit Testing Guide

Writes C# unit tests with XUnit following standard best practices, including data-driven tests.

Source Download skill
Repository
github/awesome-copilot
Stars
40,703
Licence
MIT
Files
1 file

What it does

This skill gives an AI agent a checklist of best practices for writing unit tests in C# using the XUnit framework. Once installed, when you ask for help testing C# code, the agent follows these conventions: separate test projects, Arrange-Act-Assert structure, clear test names, focused assertions, and data-driven tests using attributes like Theory and InlineData. It is guidance only and does not run anything on your machine by itself.

Great for

  • C# developers on .NET projects who want consistent XUnit tests
  • Teams adopting XUnit who want a shared set of testing conventions
  • Developers learning how to write data-driven tests in XUnit

Skip it if

  • Projects using MSTest or NUnit, since the guidance is specific to XUnit and would mislead the agent
  • Teams needing a specific mocking library choice, because the skill only suggests Moq or NSubstitute as options

Try asking

  • “Write XUnit tests for my Calculator class using best practices”
  • “Convert these fact tests into a Theory with InlineData”
  • “Set up a test project for my .NET API using XUnit”
Step-by-step guide: how to use C# XUnit Testing GuideInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 1 original files, the MIT licence and an attribution note.

    csharp-xunit.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip csharp-xunit.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip csharp-xunit.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Name the class or method you want tested so the agent can apply the naming and file conventions
  • Ask for a Theory with InlineData or MemberData when you have several input cases
  • Review generated tests and run dotnet test yourself, since the skill itself does not execute anything

What's inside

  • SKILL.md

Redistributed unmodified from github/awesome-copilot under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.