public async Task DoesNotWrapAsyncSeqFactory()
{
var seq = Substitute.For <IAsyncSeq <string> >();
var loader = new AsyncLoader <string>(seqFactory: l => seq);
await loader.TakeAsync(CancellationToken.None); // --- Perform ---
// If the factory is wrapped, a TakeAsync on loader will end up calling Take on seq
seq.DidNotReceive().Take();
await seq.Received().TakeAsync(Arg.Any <CancellationToken>());
}
public async Task CollectionChangedHandlerInvokedForTakeAsync()
{
IEnumerable <int> loadedInts = new[] { 35 };
var loader = new AsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(loadedInts),
eventContext: new RunInlineSynchronizationContext());
await loader.LoadAsync(); // load initial items
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
await loader.TakeAsync(CancellationToken.None); // --- Perform ---
listener.Received().Invoke(loader, Fluent.Match <IntChangesAlias>(changes =>
changes.Should().ContainSingle().Which.ShouldBeEquivalentTo(new ItemChange <int>(ChangeType.Removed, 35))));
}