public void CanCreateAndUseInternalTypes() { var id = Guid.NewGuid(); var expected = Guid.NewGuid().ToString(); // Proxy is used here in a public xUnit test class in order to run against the Test<T> that points to an internal type _proxy.Service <IInternalScope>().GetValue(id).Returns(expected); var actual = _proxy.SUT.GetValue(id); actual.Should().Be(expected); }