public void SHOULD_return_null_if_viewmodel_has_not_been_registered()
        {
            //Arrange
            var sut = new NavigationLookup();

            //Act
            var result = sut.GetViewType <TestViewModel>();

            //Assert
            Assert.IsNull(result);
        }
        public void SHOULD_return_type_registered_for_viewmodel()
        {
            //Arrange
            var sut = new NavigationLookup();

            sut.Register <TestView, TestViewModel>();

            //Act
            var result = sut.GetViewType <TestViewModel>();

            //Assert
            Assert.AreEqual(typeof(TestView), result);
        }