I have an object, that have internal logic related to events subscription.
I want to write an autotest, that checks if the object can be collected by GC after certain steps.
For example:

public interface IEventPublisher {
    event Action Evt;
}

public class MyClass : IDisposable {
    private IEventPubliser _evtPub;
    public MyClass(IEventPublisher evtPub) {
        _evtPub = evtPub;
    }
    public void Initialize() {
        _evtPub.Evt += EvtHandler();
    }
    private void EvtHandler() {
        // *some logic*
    }
    public void Dispose() {
        _evtPub.Evt -= EvtHandler();
    }
}


[Test]
public void MemoryLeakTest() {
    {
        // Arrange 
        var evtPub = // *mock event publisher with NSubstitute or something*
        var myObj = new MyClass(evtPub);
        
        // Act
        myObj.Initialize();
        // *do some staff maybe*
        myObj.Dispose();
    }
    
    // Assert
    // ASSERT_NO_REFERENCES_TO_myObj
}

So, the main question is what should I put instead of ASSERT_NO_REFERENCES_TO_myObj? And is it at least possible?