public void CanWrapCollectionCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => true);
Assert.AreEqual(0, viewsCollection.Count());
var item = new object();
originalCollection.Add(new ItemMetadata(item));
Assert.AreEqual(1, viewsCollection.Count());
Assert.AreSame(item, viewsCollection.First());
}
public void CanFilterCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.Name == "Possible");
originalCollection.Add(new ItemMetadata(new object()));
Assert.AreEqual(0, viewsCollection.Count());
var item = new object();
originalCollection.Add(new ItemMetadata(item) {Name = "Possible"});
Assert.AreEqual(1, viewsCollection.Count());
Assert.AreSame(item, viewsCollection.First());
}
public void ChangingMetadataOnItemAddsOrRemovesItFromTheFilteredCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.IsActive);
bool addedToCollection = false;
bool removedFromCollection = false;
viewsCollection.CollectionChanged += (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
addedToCollection = true;
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
removedFromCollection = true;
}
};
originalCollection.Add(new ItemMetadata(new object()) {IsActive = true});
Assert.IsTrue(addedToCollection);
Assert.IsFalse(removedFromCollection);
addedToCollection = false;
originalCollection[0].IsActive = false;
Assert.AreEqual(0, viewsCollection.Count());
Assert.IsTrue(removedFromCollection);
Assert.IsFalse(addedToCollection);
Assert.AreEqual(0, viewsCollection.Count());
addedToCollection = false;
removedFromCollection = false;
originalCollection[0].IsActive = true;
Assert.AreEqual(1, viewsCollection.Count());
Assert.IsTrue(addedToCollection);
Assert.IsFalse(removedFromCollection);
}
public void EnumeratesWrappedItems()
{
var originalCollection = new ObservableCollection<ItemMetadata>()
{
new ItemMetadata(new object()),
new ItemMetadata(new object())
};
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => true);
Assert.AreEqual(2, viewsCollection.Count());
Assert.AreSame(originalCollection[0].Item, viewsCollection.ElementAt(0));
Assert.AreSame(originalCollection[1].Item, viewsCollection.ElementAt(1));
}