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testland/xunit-tests

Configures and runs xUnit.net (xUnit v2 + v3) - current de facto .NET test framework with `[Fact]` for single tests + `[Theory]` + `[InlineData]`/`[ClassData]`/`[MemberData]` for parametrized; collection fixtures (`[Collection]`) + class fixtures (`IClassFixture`) for shared setup; output via `ITestOutputHelper`; parallel test config via assembly attribute. Use when working with .NET (C# / F# / VB.NET) on the modern test stack.

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fixtures-and-parallelism.mdreferences/

xUnit collections, fixtures, and parallel execution

Reference material for xunit-tests: shared setup via fixtures and how xUnit parallelizes work. Collections are the shared concept - they govern both fixture sharing and parallelization. Core authoring lives in the skill's SKILL.md.

Fixtures

// Per-test (default): xUnit creates a new test class instance per test
public class CalculatorTests {
    private readonly Calculator _calc;
    public CalculatorTests() { _calc = new Calculator(); }
    // ...
}

// Class fixture: shared across all tests in a class
public class DatabaseFixture : IDisposable {
    public DbConnection Connection { get; }
    public DatabaseFixture() { Connection = OpenConnection(); }
    public void Dispose() { Connection.Close(); }
}

public class UserTests : IClassFixture<DatabaseFixture> {
    private readonly DatabaseFixture _fixture;
    public UserTests(DatabaseFixture fixture) { _fixture = fixture; }
    [Fact] public void TestsUser() { /* uses _fixture.Connection */ }
}

// Collection fixture: shared across multiple test classes
[CollectionDefinition("DbCollection")]
public class DbCollection : ICollectionFixture<DatabaseFixture> { }

[Collection("DbCollection")]
public class TestsA { ... }

[Collection("DbCollection")]
public class TestsB { ... }   // shares the same DatabaseFixture

Parallel execution

By default xUnit runs collections in parallel; tests in the same collection run sequentially.

// Disable parallelism for an assembly:
[assembly: CollectionBehavior(DisableTestParallelization = true)]

// Or per-collection:
[assembly: CollectionBehavior(MaxParallelThreads = 4)]

references

fixtures-and-parallelism.md

SKILL.md

tile.json