How to combine PropertyData and AutoNSubstituteData attributes in xunit/autofixture?

Question

I am using the [AutoNSubstituteData] attribute, which was posted here:

AutoFixture, xUnit.net, and Auto Mocking

I would like to combine this wit

Answer 1

There are two ways to do this:

Option 1 - Using AutoFixture.Xunit and the CompositeDataAttribute class:

internal class AutoNSubstituteDataAttribute : AutoDataAttribute
{
    internal AutoNSubstituteDataAttribute()
        : base(new Fixture().Customize(new AutoNSubstituteCustomization()))
    {
    }
}

internal class AutoNSubstitutePropertyDataAttribute : CompositeDataAttribute
{
    internal AutoNSubstitutePropertyDataAttribute(string propertyName)
        : base(
            new DataAttribute[] { 
                new PropertyDataAttribute(propertyName), 
                new AutoNSubstituteDataAttribute() })
    {
    }
}

Define the test cases as below:

public class Scenario
{
    public static IEnumerable InvalidInvariantCase1
    {
        get
        {
            yield return new string[] { null };
        }
    }

    public static IEnumerable InvalidInvariantCase2
    {
        get
        {
            yield return new string[] { string.Empty };
        }
    }

    public static IEnumerable InvalidInvariantCase3
    {
        get
        {
            yield return new string[] { " " };
        }
    }
}

Then declare the parameterized test as:

public class Scenarios
{
    [Theory]
    [AutoNSubstitutePropertyData("InvalidInvariantCase1")]
    [AutoNSubstitutePropertyData("InvalidInvariantCase2")]
    [AutoNSubstitutePropertyData("InvalidInvariantCase3")]
    public void AParameterizedTest(
        string invalidConnString,
        IDeal deal,
        IDbConnection conn,
        IDb db,
        ISender sender,
        string query)
    {
    }
}

Please note that the parameterized parameter invalidConnString have to be declared before the other parameters.

Option 2 - Using Exude:

public class Scenario
{
    public void AParameterizedTest(
        IDeal deal,
        IDbConnection conn,
        IDb db,
        ISender sender,
        string invalidConnString,
        string query)
    {
    }

    [FirstClassTests]
    public static TestCase[] RunAParameterizedTest()
    {
        var testCases = new [] 
        {
            new 
            {
                invalidConnString = (string)null
            },
            new
            {
                invalidConnString = string.Empty
            },
            new
            {
                invalidConnString = " "
            }
        };

        var fixture = new Fixture()
            .Customize(new AutoNSubstituteCustomization());

        return testCases
            .Select(tc =>
                new TestCase(
                    s => s.AParameterizedTest(
                        fixture.Create(),
                        fixture.Create(),
                        fixture.Create(),
                        fixture.Create(),
                        tc.invalidConnString,
                        fixture.Create())))
            .ToArray();
    }
}