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Official agent skill

Csharp Xunit

by github in github/awesome-copilot

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

OfficialMITAuto-check passedTesting & QA

Install Csharp Xunit

skills CLI
$ npx skills add github/awesome-copilot --skill csharp-xunit -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install github/awesome-copilot csharp-xunit --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/csharp-xunit .claude/skills/csharp-xunit && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
csharp-xunit
GitHub stars
40k
Used in
1 other repo
Token cost
~677 tokens
SKILL.md length
316 words
Files
1
Skills in repo
417
Repo updated
First seen
Licence
MIT

At a glance

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

  • Tasks that involve Unit testing
  • SKILL.md covers Project Setup, Test Structure, Standard Tests and Data-Driven Tests, plus 3 more sections
  • Calls dotnet

What it does

Csharp Xunit is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Get best practices for XUnit unit testing, including data-driven tests

Its SKILL.md is about 680 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Unit testing. It works with C#. The repository describes itself as: Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot. The licence is MIT.

When your agent uses it

  • Tasks that involve Unit testing

Example prompts

  • “/csharp-xunit”

What it can do on your machine

Read from SKILL.md and the folder at commit 727ff2e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • dotnet

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Csharp Xunit loads about 677 tokens when it runs. Until then it costs about 21 tokens; SKILL.md has 316 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~21
When it runs · the whole SKILL.md, loaded when a task matches
~677

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from github/awesome-copilot at commit 727ff2e, republished under its MIT licence (© github). 316 words, ~677 tokens.

Download SKILL.mdSave it as .claude/skills/csharp-xunit/SKILL.md (or your agent's skills folder).
name
csharp-xunit
description
Get best practices for XUnit unit testing, including data-driven tests

XUnit Best Practices

Your goal is to help me write effective unit tests with XUnit, 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, xunit, and xunit.runner.visualstudio 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

  • No test class attributes required (unlike MSTest/NUnit)
  • Use fact-based tests with [Fact] attribute for simple tests
  • Follow the Arrange-Act-Assert (AAA) pattern
  • Name tests using the pattern MethodName_Scenario_ExpectedBehavior
  • Use constructor for setup and IDisposable.Dispose() for teardown
  • Use IClassFixture<T> for shared context between tests in a class
  • Use ICollectionFixture<T> for shared context between multiple test classes

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 [Theory] combined with data source attributes
  • Use [InlineData] for inline test data
  • Use [MemberData] for method-based test data
  • Use [ClassData] for class-based test data
  • Create custom data attributes by implementing DataAttribute
  • Use meaningful parameter names in data-driven tests

Assertions

  • Use Assert.Equal for value equality
  • Use Assert.Same for reference equality
  • Use Assert.True/Assert.False for boolean conditions
  • Use Assert.Contains/Assert.DoesNotContain for collections
  • Use Assert.Matches/Assert.DoesNotMatch for regex pattern matching
  • Use Assert.Throws<T> or await Assert.ThrowsAsync<T> to test exceptions
  • Use fluent assertions library for more readable assertions

Mocking and Isolation

  • Consider using Moq or NSubstitute alongside XUnit
  • 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 [Trait("Category", "CategoryName")] for categorization
  • Use collection fixtures to group tests with shared dependencies
  • Consider output helpers (ITestOutputHelper) for test diagnostics
  • Skip tests conditionally with Skip = "reason" in fact/theory attributes

© github, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/csharp-xunit of github/awesome-copilot.

Open the folder on GitHubat commit 727ff2e

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in github/awesome-copilot, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Csharp Xunit next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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Unit TestsWildGums/Orc.LicenseManager108—~2.1kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Csharp Xunit

What does Csharp Xunit do?

Get best practices for XUnit unit testing, including data-driven tests. Csharp Xunit is an agent skill from github/awesome-copilot, published by the product's own GitHub organization.

When should I use Csharp Xunit?

Csharp Xunit fits situations like: tasks that involve Unit testing.

How do I install Csharp Xunit in Claude Code?

Run `npx skills add github/awesome-copilot --skill csharp-xunit -a claude-code`. Or copy the skill folder (skills/csharp-xunit in github/awesome-copilot) into .claude/skills/csharp-xunit in your project. Claude Code loads it when a task matches its description.

How do I install Csharp Xunit in Codex?

Run `npx skills add github/awesome-copilot --skill csharp-xunit -a codex`. Or copy the skill folder (skills/csharp-xunit in github/awesome-copilot) into .agents/skills/csharp-xunit in your project. Codex loads it when a task matches its description.

Can I use Csharp Xunit in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add github/awesome-copilot --skill csharp-xunit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/csharp-xunit, .gemini/skills/csharp-xunit, .github/skills/csharp-xunit and .opencode/skills/csharp-xunit in your project.

What does Csharp Xunit need to run?

Going by SKILL.md and its folder, Csharp Xunit needs the command-line tools its instructions call (dotnet).

Does Csharp Xunit access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Csharp Xunit safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Csharp Xunit use?

Csharp Xunit is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Csharp Xunit use?

About 677 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Csharp Xunit?

Skills that share tags, products or a category with Csharp Xunit: ScottPlot Test Runner (ScottPlot/ScottPlot, 6.8k stars), Tsp Csharp Xunit (querylenshq/ef-querylens, 225 stars), Gdunit Driver (RandallLiuXin/GodotMaker, 549 stars) and Verify (valdisiljuconoks/LocalizationProvider, 180 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Csharp Xunit?

github (a GitHub organization, an official publisher) maintains it in github/awesome-copilot, which has 39,748 GitHub stars. The repository holds 417 skills in this directory. The repository was last updated on October 7, 2026.

Source: github/awesome-copilot on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.