public void ClearDelegatesToUnderlyingSeq()
{
var seq = Substitute.For <ISeq <int> >();
var loader = new ThreadSafeAsyncLoader <int>(enumerable => seq);
loader.Clear(); // --- Perform ---
seq.Received().Clear();
}
public void ClearDoesNotNotifyIfNoChangesWereMade()
{
var loader = new ThreadSafeAsyncLoader <int>(Seq.ListBased, eventContext: new RunInlineSynchronizationContext());
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
loader.Clear(); // --- Perform ---
listener.DidNotReceive().Invoke(loader, Arg.Any <IntChangesAlias>());
}
public void ClearNotifiesOfChangesMade()
{
IEnumerable <int> initialValues = new[] { 1, 2, 3 };
var expectedChanges = initialValues.Select(i => new ItemChange <int>(ChangeType.Removed, i));
var loader = new ThreadSafeAsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(initialValues),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
loader.Clear(); // --- Perform ---
listener.Received().Invoke(loader, Fluent.Match <IntChangesAlias>(
changes => changes.Should().BeEquivalentTo(expectedChanges)));
}
public void ClearNotifiesOfChangeForSingletonSeq()
{
IEnumerable <int> initialValues = new[] { 1 };
var loader = new ThreadSafeAsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(initialValues),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
loader.Clear(); // --- Perform ---
listener.Received().Invoke(loader, Fluent.Match <IntChangesAlias>(changes => changes
.Should().ContainSingle("because loader contained single item before Clear")
.Which.Should().BeRemovalOf(1, "because loader contained the value 1 before Clear")));
}