TestFixtureData

The TestFixtureData class provides specific instance information for a parameterized fixture, although any object deriving from TestFixtureParameters may be used. Unlike NUnit 2, you cannot implement IFixtureData, you must derive from TestFixtureParameters.

The following example varies the example shown under TestFixture Attribute by using a TestFixtureSourceAttribute with a data source in a separately defined class.

[TestFixtureSource(typeof(MyFixtureData), nameof(MyFixtureData.FixtureParams))]
public class ParameterizedTestFixture
{
    private readonly string _eq1;
    private readonly string _eq2;
    private readonly string? _neq;

    public ParameterizedTestFixture(string eq1, string eq2, string? neq)
    {
        _eq1 = eq1;
        _eq2 = eq2;
        _neq = neq;
    }

    public ParameterizedTestFixture(string eq1, string eq2)
        : this(eq1, eq2, null) { }

    public ParameterizedTestFixture(int eq1, int eq2, int neq)
    {
        _eq1 = eq1.ToString();
        _eq2 = eq2.ToString();
        _neq = neq.ToString();
    }

    [Test]
    public void TestEquality()
    {
        Assert.That(_eq2, Is.EqualTo(_eq1));
        Assert.That(_eq2.GetHashCode(), Is.EqualTo(_eq1.GetHashCode()));
    }

    [Test]
    public void TestInequality()
    {
        Assert.That(_neq, Is.Not.EqualTo(_eq1));
        if (_neq != null)
        {
            Assert.That(_neq.GetHashCode(), Is.Not.EqualTo(_eq1.GetHashCode()));
        }
    }
}

public class MyFixtureData
{
    public static IEnumerable FixtureParams
    {
        get
        {
            yield return new TestFixtureData("hello", "hello", "goodbye");
            yield return new TestFixtureData("zip", "zip");
            yield return new TestFixtureData(42, 42, 99);
        }
    }
}