fluent nunit tests

gistfile1.cs

[TestFixture]
public class RepresentativeServiceTests
{
    public class TestStory
    {
        public class Fail
        {
            public static IEnumerable Constructor
            {
                get
                {
                    IUserContext userContext = null;
                    INavServiceClient navServiceClient = null;
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context is null");
                    userContext = Mock.Of<IUserContext>();
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Service is null");
                    navServiceClient = Mock.Of<INavServiceClient>();
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.CustomerNumber is null");
                    Mock.Get(userContext).Setup(o => o.CustomerNumber).Returns((string)null);
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.CustomerNumber has value (string)null");
                    Mock.Get(userContext).Setup(o => o.CustomerNumber).Returns(string.Empty);
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.CustomerNumber has value string.Empty");
                    Mock.Get(userContext).Setup(o => o.CustomerNumber).Returns("000007");
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.PersonalCode is null");
                    Mock.Get(userContext).Setup(o => o.PersonalCode).Returns((string)null);
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.PersonalCode has value (string)null");
                    Mock.Get(userContext).Setup(o => o.PersonalCode).Returns(string.Empty);
                    yield return new TestCaseData(userContext, navServiceClient).Throws(typeof(ArgumentNullException)).SetName("Context.PersonalCode has value string.Empty");
                }
            }
        }
        public class Pass
        {
            public static IEnumerable Constructor
            {
                get
                {
                    var userContext = Mock.Of<IUserContext>();
                    var navServiceClient = Mock.Of<INavServiceClient>();
                    Mock.Get(userContext).Setup(o => o.CustomerNumber).Returns("000007");
                    Mock.Get(userContext).Setup(o => o.PersonalCode).Returns("38703070123");
                    yield return new TestCaseData(userContext, navServiceClient).SetName("Representative service created");
                }
            }
        }
    }
    [Test, TestCaseSource(typeof(TestStory.Fail), nameof(TestStory.Fail.Constructor))]
    public void RepresentativeServiceFailTests(IUserContext userContext, INavServiceClient navServiceClient)
    {
        new RepresentativeService(userContext, navServiceClient);
    }
    [Test, TestCaseSource(typeof(TestStory.Pass), nameof(TestStory.Pass.Constructor))]
    public void RepresentativeServicePassTests(IUserContext userContext, INavServiceClient navServiceClient)
    {
        new RepresentativeService(userContext, navServiceClient);
    }
}