public void ReplaceAllNotifiesOfChangesMade()
{
IEnumerable <int> loadedInts = new int[] { 1, 2, 3, 4 };
var replacements = new int[] { 5, 6 };
var expectedChanges = loadedInts.Select(i => new ItemChange <int>(ChangeType.Removed, i))
.Concat(replacements.Select(i => new ItemChange <int>(ChangeType.Added, i)));
var loader = new ThreadSafeAsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(loadedInts),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
var listener = Substitute.For <CollectionChangedHandler <int> >();
loader.CollectionChanged += listener;
loader.Should().Equal(loadedInts); // sanity check
loader.ReplaceAll(replacements); // --- Perform ---
loader.Should().Equal(replacements); // sanity check
listener.Received().Invoke(loader, Fluent.Match <IntChangesAlias>(
changes => changes.Should().BeEquivalentTo(expectedChanges)));
}
public void ReplaceAllUsesIdentityComparerGivenAtConstruction()
{
IEnumerable <IntWrapper> originalItems = new IntWrapper[] { 1, 2, 3 };
var replacements = new IntWrapper[] { 1, 3 };
// NOTE: Due to conservate update check, unchanged items will appear as item changes of type update
// NOTE2: Need to use the actual instances, since IntWrapper uses reference equality
var expectedChanges = new ItemChange <IntWrapper>[]
{
new ItemChange <IntWrapper>(ChangeType.Updated, replacements[0]),
new ItemChange <IntWrapper>(ChangeType.Updated, replacements[1]),
new ItemChange <IntWrapper>(ChangeType.Removed, originalItems.ElementAt(1))
};
var loader = new ThreadSafeAsyncLoader <IntWrapper>(
Seq.ListBased,
loadDataAsync: _ => Task.FromResult(originalItems),
identityComparer: new IntWrapperComparer(),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
loader.CollectionChanged += (s, e) =>
{
// Verify that the actual changes match the expected changes
e.Should().BeEquivalentTo(expectedChanges);
};
loader.ReplaceAll(replacements); // --- Perform ---
}
public void ReplaceAllDelegatesToUnderlyingSeq()
{
var items = new[] { 1, 2, 3, 4 };
var seq = Substitute.For <ISeq <int> >();
var loader = new ThreadSafeAsyncLoader <int>(enumerable => seq);
loader.ReplaceAll(items); // --- Perform ---
seq.Received().ReplaceAll(items);
}
public void ReplaceAllDoesNotAllowDuplicatesInNewItems()
{
IEnumerable <int> loadedInts = new[] { 1, 2, 3 };
var replacements = new[] { 2, 2 };
var loader = new ThreadSafeAsyncLoader <int>(
Seq.ListBased,
loadDataAsync: tok => Task.FromResult(loadedInts),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
// --- Perform ---
Action callingReplaceAll = () => loader.ReplaceAll(replacements);
callingReplaceAll.ShouldThrow <ArgumentException>("because duplicates are not allowed").WithMessage("*duplicates*");
}
public void ReplaceAllUsesUpdateComparerGivenAtConstruction()
{
IEnumerable <int> originalItems = new int[] { 1, 2, 3 };
var replacements = new int[] { 1, 3 };
// Since equal int values will now count as unchanged, we do not expect item changes that are updates
var expectedChanges = new ItemChange <int>[] { new ItemChange <int>(ChangeType.Removed, 2) };
var loader = new ThreadSafeAsyncLoader <int>(
Seq.ListBased,
loadDataAsync: _ => Task.FromResult(originalItems),
updateComparer: new IntUpdateComparer(),
eventContext: new RunInlineSynchronizationContext());
loader.LoadAsync(); // load initial values
loader.CollectionChanged += (s, e) =>
{
// Verify that the actual changes match the expected changes
e.Should().BeEquivalentTo(expectedChanges);
};
loader.ReplaceAll(replacements); // --- Perform ---
}