xunit-skill

Q: How do I install xunit-skill?

Run npx skills add https://github.com/lambdatest/agent-skills --skill xunit-skill 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/xunit-skill/ (personal) or .claude/skills/xunit-skill/ (project).

by lambdatestAI & Agents

Generates xUnit.net tests in C. Covers Fact/Theory, constructor injection, IClassFixture, and FluentAssertions. Use when user mentions "xUnit", "[Fact]", "[Theory]", "Assert.Equal", "C xUnit". Triggers on: "xUnit", "[Fact]", "[Theory]", "Assert.Equal C", "xUnit.net".

Installs: 210
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/lambdatest/agent-skills --skill xunit-skill

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads xunit-skill automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

xUnit.net Testing Skill

Core Patterns

Basic Test

using Xunit;

public class CalculatorTests
{
    private readonly Calculator _calc = new();

    [Fact]
    public void Add_TwoPositiveNumbers_ReturnsSum()
    {
        Assert.Equal(5, _calc.Add(2, 3));
    }

    [Fact]
    public void Divide_ByZero_ThrowsException()
    {
        Assert.Throws<DivideByZeroException>(() => _calc.Divide(10, 0));
    }
}

Theory (Parameterized)

[Theory]
[InlineData(2, 3, 5)]
[InlineData(-1, 1, 0)]
[InlineData(0, 0, 0)]
public void Add_ReturnsCorrectSum(int a, int b, int expected)
{
    Assert.Equal(expected, _calc.Add(a, b));
}

[Theory]
[MemberData(nameof(GetTestData))]
public void Add_WithMemberData(int a, int b, int expected)
{
    Assert.Equal(expected, _calc.Add(a, b));
}

public static IEnumerable<object[]> GetTestData()
{
    yield return new object[] { 1, 2, 3 };
    yield return new object[] { -1, -1, -2 };
}

[Theory]
[ClassData(typeof(CalculatorTestData))]
public void Add_WithClassData(int a, int b, int expected)
{
    Assert.Equal(expected, _calc.Add(a, b));
}

Assertions

Assert.Equal(expected, actual);
Assert.NotEqual(unexpected, actual);
Assert.True(condition);
Assert.False(condition);
Assert.Null(obj);
Assert.NotNull(obj);
Assert.Contains("sub", str);
Assert.DoesNotContain("x", str);
Assert.Empty(collection);
Assert.Single(collection);
Assert.Collection(list,
    item => Assert.Equal("first", item),
    item => Assert.Equal("second", item));
Assert.IsType<MyClass>(obj);
var ex = Assert.Throws<ArgumentException>(() => Method());
Assert.Equal("message", ex.Message);
Assert.InRange(value, 1, 10);

Shared Context (IClassFixture)

public class DatabaseFixture : IDisposable
{
    public DbConnection Connection { get; }
    public DatabaseFixture() { Connection = new DbConnection("test"); }
    public void Dispose() { Connection.Close(); }
}

public class UserTests : IClassFixture<DatabaseFixture>
{
    private readonly DatabaseFixture _fixture;
    public UserTests(DatabaseFixture fixture) { _fixture = fixture; }

    [Fact]
    public void GetUser_ReturnsUser()
    {
        var user = _fixture.Connection.Query<User>("SELECT * FROM Users LIMIT 1");
        Assert.NotNull(user);
    }
}

Constructor/Dispose (Per-Test Setup)

public class MyTests : IDisposable
{
    private readonly MyService _service;
    public MyTests() { _service = new MyService(); }   // SetUp
    public void Dispose() { _service.Cleanup(); }       // TearDown

    [Fact]
    public void TestSomething() { Assert.True(_service.IsReady); }
}

Anti-Patterns

Bad	Good	Why
`[Fact]` with parameters	`[Theory]` + `[InlineData]`	xUnit convention
Static state	`IClassFixture`	Test isolation
No `IDisposable`	Implement for cleanup	Resource management

Setup: `dotnet add package xunit xunit.runner.visualstudio Microsoft.NET.Test.Sdk`

Run: `dotnet test` or `dotnet test --filter "FullyQualifiedName~Calculator"`

Deep Patterns

For advanced patterns, debugging guides, CI/CD integration, and best practices, see reference/playbook.md.

FAQ

What does the xunit-skill skill do?

How do I install xunit-skill?

Run npx skills add https://github.com/lambdatest/agent-skills --skill xunit-skill 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/xunit-skill/ (personal) or .claude/skills/xunit-skill/ (project).

Which AI agents can use xunit-skill?

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 xunit-skill safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains xunit-skill?

It is published by lambdatest in lambdatest/agent-skills. It has 210 recorded installs.

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Testing & QA539 installs