public void RedisRemoveDesignerViewModel_Constructor_ModelItemIsValid_UpdateHelpDescriptor()
        {
            var expectedHelpText = "redis help text";

            var mockHelpViewModel = new Mock <IHelpWindowViewModel>();

            mockHelpViewModel.Setup(helpViewModel => helpViewModel.UpdateHelpText(expectedHelpText));
            var mockShellViewModel = new Mock <IShellViewModel>();

            mockShellViewModel.Setup(shellViewModel => shellViewModel.HelpViewModel).Returns(mockHelpViewModel.Object);
            CustomContainer.Register(mockShellViewModel.Object);

            var expectedId  = Guid.NewGuid();
            var redisSource = new RedisSource
            {
                ResourceID         = expectedId,
                ResourceName       = "ResourceName",
                HostName           = "HostName",
                Port               = "6379",
                AuthenticationType = Runtime.ServiceModel.Data.AuthenticationType.Anonymous
            };

            var redisSources = new List <RedisSource> {
                redisSource
            };

            var mockResourceRepository = new Mock <IResourceRepository>();

            mockResourceRepository.Setup(resourceRepository => resourceRepository.FindSourcesByType <RedisSource>(It.IsAny <IServer>(), enSourceType.RedisSource)).Returns(redisSources);
            var mockServer = new Mock <IServer>();

            mockServer.Setup(server => server.ResourceRepository).Returns(mockResourceRepository.Object);

            //------------Execute Test---------------------------
            var redisRemoveDesignerViewModel = new RedisRemoveDesignerViewModel(CreateModelItem(), mockServer.Object, mockShellViewModel.Object);

            Assert.AreEqual("Use the Redis Remove tool to remove existing key with data from cache.", redisRemoveDesignerViewModel.HelpText);
            redisRemoveDesignerViewModel.UpdateHelpDescriptor(expectedHelpText);

            mockHelpViewModel.Verify(helpViewModel => helpViewModel.UpdateHelpText(expectedHelpText), Times.Once);
        }