[Test]
public async Task Parsing_A_Valid_Date_Succeeds()
{
    var date = DateTime.Parse("2025-01-01");

    await Assert.That(date.Year).IsEqualTo(2025);
    await Assert.That(date.Month).IsEqualTo(1);
}

[Test]
[Arguments("user1@test.com", "ValidPassword123")]
[Arguments("user2@test.com", "AnotherPassword456")]
[Arguments("admin@test.com", "AdminPass789")]
public async Task User_Login_Should_Succeed(string email, string password)
{
    var result = await authService.LoginAsync(email, password);
    await Assert.That(result.IsSuccess).IsTrue();
}

// Matrix — generates a test for every combination (9 total here)
[Test]
[MatrixDataSource]
public async Task Database_Operations_Work(
    [Matrix("Create", "Update", "Delete")] string operation,
    [Matrix("User", "Product", "Order")] string entity)
{
    await Assert.That(await ExecuteOperation(operation, entity))
        .IsTrue();
}

[Before(Class)]
public static async Task SetupDatabase(ClassHookContext context)
{
    await DatabaseHelper.InitializeAsync();
}

[Test]
[MethodDataSource(nameof(GetTestUsers))]
public async Task Register_User(string username, string password) { ... }

[Test, DependsOn(nameof(Register_User))]
[Retry(3)]
public async Task Login_With_Registered_User(string username, string password)
{
    // Guaranteed to run after Register_User passes
}

public class WindowsOnlyAttribute : SkipAttribute
{
    public WindowsOnlyAttribute() : base("Windows only") { }

    public override Task<bool> ShouldSkip(TestContext testContext)
        => Task.FromResult(!OperatingSystem.IsWindows());
}

[Test, WindowsOnly]
public async Task Windows_Specific_Feature() { ... }