public void ItemRemoved_CallsNotifyChange()
{
var removedItem = CreateItem("Removed item");
Collection = CreateCollection();
HandleItemRemoved(removedItem);
AssertChangeArgs(ChangeArgs.ItemsRemoved(Collection, new[] { removedItem }));
}
public void ItemsRemoved_SetsChangedPathToEmpty()
{
var collection = VMCollectionStub.Build();
var oldItems = new[] { ViewModelStub.Build() };
var args = ChangeArgs.ItemsRemoved(collection, oldItems);
Assert.AreEqual(ChangeType.RemovedFromCollection, args.ChangeType);
CollectionAssert.AreEqual(oldItems, args.OldItems.ToArray());
Assert.IsFalse(args.NewItems.Any());
DomainAssert.AreEqual(Path.Empty.Append(collection), args.ChangedPath);
}
public void ItemSet_CallsNotifyChangeForOldAndNewItem()
{
var oldItem = CreateItem("Old item");
var newItem = CreateItem("New item");
Collection = CreateCollection(newItem);
HandleItemSet(previousItem: oldItem, item: newItem);
AssertChangeArgs(
ChangeArgs.ItemsRemoved(Collection, oldItems: new[] { oldItem }),
ChangeArgs.ItemsAdded(Collection, newItems: new[] { newItem })
);
}
public void HandleChange_WithItemsAddedOrRemovedFromOwnCollection_UpdatesCachedResults()
{
var owner = new TestVM();
owner.MakePropertiesAndViewModelInvalid();
var expected = owner.GetCurrentlySetupResults();
// F I R S T A D D
var firstNewItem = new ViewModelStub {
ValidationResult = CreateValidationResult("First new item error")
};
var collectionChangeArgs = ChangeArgs
.ItemsAdded(VMCollectionStub.Build(), new[] { firstNewItem })
.PrependViewModel(owner);
owner.CallHandleChangeWith(collectionChangeArgs);
expected.Descenants = firstNewItem.ValidationResult;
AssertBehaviorResults(owner, expected);
// S E C O N D A D D
var secondNewItem = new ViewModelStub {
ValidationResult = CreateValidationResult("Second new Item error")
};
collectionChangeArgs = ChangeArgs
.ItemsAdded(VMCollectionStub.Build(), new[] { secondNewItem })
.PrependViewModel(owner);
owner.CallHandleChangeWith(collectionChangeArgs);
expected.Descenants = ValidationResult.Join(
firstNewItem.ValidationResult,
secondNewItem.ValidationResult
);
AssertBehaviorResults(owner, expected);
// R E M O V AL
collectionChangeArgs = ChangeArgs
.ItemsRemoved(VMCollectionStub.Build(), new[] { firstNewItem })
.PrependViewModel(owner);
owner.CallHandleChangeWith(collectionChangeArgs);
expected.Descenants = secondNewItem.ValidationResult;
AssertBehaviorResults(owner, expected);
}
public void ItemsCleared_CallsNotifyChange()
{
var oldItems = new[] {
CreateItem("Old item 1"),
CreateItem("Old item 2")
};
Collection = CreateCollection();
HandleCollectionCleared(previousItems: oldItems);
AssertChangeArgs(
ChangeArgs.ItemsRemoved(Collection, oldItems: oldItems)
);
}
