TestExplorer cannot understand TestCase-naming-style

[Kohlroulade]

Description

I have an implementation for ITestDiscoverer as follows:

class MyClass : ITestDiscoverer
{
    public void DiscoverTests(IEnumerable<string> sources, IDiscoveryContext discoveryContext, IMessageLogger logger, ITestCaseDiscoverySink discoverySink)
    {
        discoverySink.SendTestCase(new TestCase(
          "My.Namespace.MyType.MyMember.MyMember(1)", 
          new Uri("executor://myexecutor/v1"), 
          "path\\to\\my.test.assembly.dll"));
    }
}

Furtmerore my test-project has this class:

namespace My.Namespace
{
    [TestFixture]
    public class MyType
    {
        [TestCase(1)
        public void MyMember(int n) { ... }
    }
}

However VS TestExplorer cannot interpret the testcase's name and allways just assumes My.Namespace.MyType to be the namespace, instead of My.Namespace.

I omited the very first level of hierarchy, which applies to the assembly. So there's no way to indicate where the namespace for a particular testcase ends and where its member starts. Furthermore the test appears twice in TestExplorer. I assume this is because some default (?) test-discoverer also running.

Steps to reproduce

Create a new adapter and add it to your test-project as a reference. Then use TestExplorer to see the testcase appearing twice: once with namespace being My.Namespace.MyType and once with My.Namespace.

Using VS2022.

Expected behavior

TestCase should only appear once, with second hierarchy (=namespace) My.Namespace and third hierarchy (=type) MyType.

Actual behavior

TestCase appears twice, once with namespace being My.Namespace.MyType and once with My.Namespace

Environment

running VS2022 on Windows and NUnit 4.1