public async Task SelectedItem_NotNull_AfterInitializeAsync()
{
var mockNavigationService = new Mock <INavigationService>();
var mockDialogService = new Mock <IDialogService>();
var mockItemsService = new ItemsService(new FakeItemsRepository(), new InMemoryBlobCache());
var itemDetailViewModel = new ItemDetailViewModel(mockNavigationService.Object, mockDialogService.Object, mockItemsService);
await itemDetailViewModel.InitializeAsync(ItemBuilder.Typical().Build());
Assert.NotNull(itemDetailViewModel.SelectedItem);
}
public void SelectedItemQuantity_CanNotBe_LessThanZero()
{
var mockNavigationService = new Mock <INavigationService>();
var mockDialogService = new Mock <IDialogService>();
var mockItemsService = new Mock <IItemsService>();
var itemDetailViewModel =
new ItemDetailViewModel(mockNavigationService.Object, mockDialogService.Object, mockItemsService.Object)
{
SelectedItem = ItemBuilder.TypicalWId().Build()
};
var currValue = itemDetailViewModel.SelectedItem.Quantity;
var newValue = GetRandom.Int32(-100, -1);
Assert.Throws <ArgumentOutOfRangeException>(()
=> itemDetailViewModel.ModifyQuantityCommand.Execute(new ValueChangedEventArgs(currValue, newValue)));
}
public void SelectedItemQuantity_IsUpdated_WhenItemQuantityIsChanged()
{
var mockNavigationService = new Mock <INavigationService>();
var mockDialogService = new Mock <IDialogService>();
var mockItemsService = new Mock <IItemsService>();
var itemDetailViewModel =
new ItemDetailViewModel(mockNavigationService.Object, mockDialogService.Object, mockItemsService.Object)
{
SelectedItem = ItemBuilder.TypicalWId().Build()
};
//the new value will be the existing value + or - a random number .
var currValue = itemDetailViewModel.SelectedItem.Quantity;
var newValue = currValue + GetRandom.Int32(-currValue, 100);//-currValue to guarantee that we dont have less than 0
itemDetailViewModel.ModifyQuantityCommand.Execute(new ValueChangedEventArgs(currValue, newValue));
Assert.Equal(newValue, itemDetailViewModel.SelectedItem.Quantity);
}
public void PropertyChanged_IsCalled_WhenItemQuantityIsChanged()
{
var mockNavigationService = new Mock <INavigationService>();
var mockDialogService = new Mock <IDialogService>();
var mockItemsService = new Mock <IItemsService>();
var itemDetailViewModel =
new ItemDetailViewModel(mockNavigationService.Object, mockDialogService.Object, mockItemsService.Object)
{
SelectedItem = ItemBuilder.TypicalWId().Build()
};
//subscribe
var parameterChangedName = string.Empty;
itemDetailViewModel.PropertyChanged += (sender, e) => parameterChangedName = e.PropertyName;
itemDetailViewModel.ModifyQuantityCommand.Execute(new ValueChangedEventArgs(GetRandom.Int16(), GetRandom.Int16()));
Assert.Equal(nameof(itemDetailViewModel.SelectedItem), parameterChangedName);
}