public async Task FirstRequestFails()
{
var source = new DataSource <int>(AllData, DataSource <int> .ThrowException);
var collection = new IncrementalLoadingCollection <DataSource <int>, int>(source, PageSize);
await Assert.ThrowsExceptionAsync <AggregateException>(collection.LoadMoreItemsAsync(0).AsTask);
Assert.IsTrue(!collection.Any());
var requests = new List <Task>();
for (int pageNum = 1; pageNum <= Pages; pageNum++)
{
requests.Add(collection.LoadMoreItemsAsync(0).AsTask()
.ContinueWith(t => Assert.IsTrue(t.IsCompletedSuccessfully)));
}
await Task.WhenAll(requests);
CollectionAssert.AreEqual(AllData, collection);
}
