NUnit TestCase with Generics

Question

Is there any way to pass generic types using a TestCase to a test in NUnit?

This is what I would like to do but the syntax is not correct...

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Answer 1

I slightly modified the TestCaseGenericAttribute somebody posted here:

[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public class GenericTestCaseAttribute : TestCaseAttribute, ITestBuilder
{
    public GenericTestCaseAttribute(params object[] arguments)
        : base(arguments)
    {
    }

    IEnumerable ITestBuilder.BuildFrom(IMethodInfo method, Test suite)
    {
        if (!method.IsGenericMethodDefinition) return base.BuildFrom(method, suite);
        var numberOfGenericArguments = method.GetGenericArguments().Length;
        var typeArguments = Arguments.Take(numberOfGenericArguments).OfType().ToArray();

        if (typeArguments.Length != numberOfGenericArguments)
        {
            var parms = new TestCaseParameters { RunState = RunState.NotRunnable };
            parms.Properties.Set("_SKIPREASON", $"Arguments should have {typeArguments} type elements");
            return new[] { new NUnitTestCaseBuilder().BuildTestMethod(method, suite, parms) };
        }

        var genMethod = method.MakeGenericMethod(typeArguments);
        return new TestCaseAttribute(Arguments.Skip(numberOfGenericArguments).ToArray()).BuildFrom(genMethod, suite);
    }
}

This version expects one list of all parameters, starting with the type parameters, starting with the type paramters. Usage:

    [Test]
    [GenericTestCase(typeof(IMailService), typeof(MailService))]
    [GenericTestCase(typeof(ILogger), typeof(Logger))]
    public void ValidateResolution(Type type)
    {
        // arrange
        var sut = new AutoFacMapper();

        // act
        sut.RegisterMappings();
        var container = sut.Build();

        // assert
        var item = sut.Container.Resolve();
        Assert.AreEqual(type, item.GetType());
    }