public void CollectionChangedHandlerInvokedForTake()
{
IEnumerable <int> loadedInts = new[] { 42 };
var loader = new AsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(loadedInts),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial items
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
loader.Take(); // --- Perform ---
listener.Received().Invoke(loader, Fluent.Match <IntChangesAlias>(changes =>
changes.Should().ContainSingle().Which.ShouldBeEquivalentTo(new ItemChange <int>(ChangeType.Removed, 42))));
}