Custom Trait-Attribute causes non-stop Discovery of Test-Methods in VS 2019

[lanluu]

Hi,

in VS 2019 I am suffering a situation in that the discovery of xUnit Test-Methods in Test-Explorer (i.e. testhost process) runs endless, if any Test-Method has Custom-Trait-Attribute i.e. by adding any class inhered from ITraitAttribute and ITraitDiscoverer, for instance: https://github.com/xunit/samples.xunit/tree/master/TraitExtensibility

I would appreciate any idea in this case.

Thanks and best regards!

[lanluu]

As I figured out, this situation can caused in case the Custom-Trait-Attribute throws any Exception in Constructor e.g. because of validation of input params. For instance:

    [TraitDiscoverer("...", "...")]
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public class ClassificationAttribute : Attribute, ITraitAttribute
    {
        public ClassificationAttribute(params Type[] traits)
        {
            // if you throw any Exception here because of invalid parameters,
            // and any Test-Method has this Attribute with invalid parameters,
            // then testhost process (in Test-Explorer) will run endless.
        }
    }

I hope it might help someones.

[bradwilson]

Does this only fail in Visual Studio? If so, this issue needs to be moved to the right repo.

[lanluu]

Yes, only in Visual Studio. To which Repo should I move this thread?

[bradwilson]

I'll move it. :)

[djalan]

Same problem in Visual Studio 2022 when you use package SkippableFact for Xunit. It causes non-stop discovery like 33% of the time.

[djalan]

Same problem in Visual Studio 2022 when you use package SkippableFact for Xunit. It causes non-stop discovery like 33% of the time.

I tested in a separate project and it seems fine.

BUT.

It is surely because my problematic project has its own class implementing XunitTestFramework. But the problem does not happen all the time.

[bradwilson]

@djalan If you can provide a repro project that would be very helpful. Thanks!