After upgrading to .NET Core 3.0 an exception is thrown for some of the JustMock methods like DoNothing() and Throw(). In the case for DoNothing() the exception is thrown only for methods that are returning value.
Here is the full exception:
System.InvalidCastException : Unable to cast object of type 'System.AppDomainSetup' to type 'YourType'
Docker is a container acting like an isolated environment. Research how the JustMock profiler can be registered into such container. Hosted VSTS should work on the same principle. Research how the registry could be accessed through VSTS extension or other tools.