public void AddingItemMessageHandler_WhenInvoked_AddsNewItemToAdvertisementCollection()
{
// Arrange
var repository = GetNewspaperRepository();
var message = new AddingAdvertisementItemMessage();
var collectionViewModel = new AdvertisementCollectionViewModel(repository);
collectionViewModel.Advertisements.Count.Should().Be(0, "There are no items in the collection initially.");
// Act
Messenger.Default.Send(message);
// Assert
collectionViewModel.Advertisements.Count.Should().Be(1, "A new item should have been added to the collection.");
collectionViewModel.Advertisements.First().Name.Should().Be(Advertisement.MSG_NEW_ADVERTISEMENT_NAME,
"The new item should be a new Advertisement.");
}
public void SelectedItemChangedHandler_WhenInvoked_SendsMessageAdvertisementChanged()
{
// Arrange
var messageReceived = false;
AdvertisementItemViewModel vm = null;
var repository = GetNewspaperRepository();
var model1 = new Advertisement() {Name = "Ad 1", Text="Text 1"};
var model2 = new Advertisement {Name = "Ad 2", Text="Text 2"};
var adItemVm1 = new AdvertisementItemViewModel(repository) {Model = model1};
var adItemVm2 = new AdvertisementItemViewModel(repository) {Model = model2};
var collectionViewModel = new AdvertisementCollectionViewModel(repository);
Messenger.Default.Register<CurrentAdvertisementItemChangedMessage>(this, (msg) =>
{
messageReceived = true;
vm = msg.ItemViewModel;
});
var args = new RoutedPropertyChangedEventArgs<object>(null,adItemVm2);
collectionViewModel.Advertisements.Add(adItemVm1);
collectionViewModel.Advertisements.Add(adItemVm2);
// Act
collectionViewModel.SelectedItemChangedCommand.Execute(args);
// Assert
messageReceived.Should().Be(true, "The CurrentItemChangedMessage message was sent.");
collectionViewModel.CurrentItem.Should().Be(adItemVm2, "The current item is the last one added.");
vm.Model.Should().Be(adItemVm2.Model, "The added model was sent in the message.");
}
public void CancelCommand_WhenInvoked_ResetsNameToCollectionCurrentValue()
{
// Arrange
var repository = Substitute.For<INewspaperAdRepository>();
repository.GetAllAdvertisements().Returns(new List<Advertisement>());
var detailViewModel = new AdvertisementDetailViewModel(repository);
var collectionViewModel = new AdvertisementCollectionViewModel(repository);
detailViewModel.AddItemCommand.Execute(null);
collectionViewModel.CurrentItem.Should().Be(detailViewModel.ItemViewModel,
"The detail model points to the Collection CurrentItem");
var oldName = collectionViewModel.CurrentItem.Name;
var newName = "Changed Advertisement Name";
detailViewModel.Name = newName;
collectionViewModel.CurrentItem.Name.Should().Be(oldName, "Name in the collection should not change");
detailViewModel.Name.Should().Be(newName, "Alteration is reflected in the detail view model");
// Act
detailViewModel.CancelItemCommand.Execute(null);
// Assert
detailViewModel.Name.Should().Be(oldName, "The Advertisement name should revert back");
collectionViewModel.CurrentItem.Should().Be(detailViewModel.ItemViewModel,
"The entire instance should have reverted back to the original value");
}
public void SaveCommand_WhenInvoked_UpdatesCollectionCurrentItemWithNewValue()
{
// Arrange
var repository = Substitute.For<INewspaperAdRepository>();
repository.GetAllAdvertisements().Returns(new List<Advertisement>());
var detailViewModel = new AdvertisementDetailViewModel(repository);
var collectionViewModel = new AdvertisementCollectionViewModel(repository);
detailViewModel.AddItemCommand.Execute(null);
collectionViewModel.CurrentItem.Should().Be(detailViewModel.ItemViewModel,
"The detail model points to the Collection CurrentItem");
var oldName = collectionViewModel.CurrentItem.Name;
var newName = "Changed Advertisement Name";
detailViewModel.Name = newName;
var paperCount = detailViewModel.Newspapers.Count;
// Act
detailViewModel.SaveItemCommand.Execute(null);
// Assert
collectionViewModel.CurrentItem.Should().Be(detailViewModel.ItemViewModel,
"The current item in the collection matches the one in the detail view model.");
detailViewModel.Newspapers.ToList().ForEach(n => repository.Received().Save(n.Model));
}
