public void GetMessage()
        {
            var writerMock = MockRepository.GenerateMock <TextMessageWriter>();

            writerMock.Expect(mock => mock.Write("Expected: ExpectedName	 but was: First, Second"));
            writerMock.Replay();

            var constraint = new EnumValueInfoListContentsConstraint("ExpectedName");

            PrivateInvoke.SetNonPublicField(constraint, "actual", _list);
            constraint.WriteMessageTo(writerMock);

            writerMock.VerifyAllExpectations();
        }