public async Task should_load_incrementally_from_an_existing_storage()
{
var storage = new MemoryStorage();
await Task.WhenAll(Enumerable.Range(0, 8).Select(x => storage.Put(new TestStorageObject(x))));
var collection = new StorageCollection<TestStorageObject>(storage, "0", "6");
Assert.True(collection.HasMoreItems);
Assert.Equal(0, collection.Count);
await collection.LoadMoreItemsAsync(2);
Assert.Equal(2, collection.Count);
Assert.Equal(collection.Select(e => e.Id), Enumerable.Range(0, 2).Select(i => i.ToString()));
await collection.LoadMoreItemsAsync(2);
Assert.Equal(4, collection.Count);
Assert.Equal(collection.Select(e => e.Id), Enumerable.Range(0, 4).Select(i => i.ToString()));
Assert.False(collection.IsLoading);
Assert.True(collection.HasMoreItems);
await collection.LoadMoreItemsAsync(10);
Assert.Equal(6, collection.Count);
Assert.False(collection.HasMoreItems);
Assert.Equal(collection.Select(e => e.Id), Enumerable.Range(0, 6).Select(i => i.ToString()));
}
public async Task should_sync_to_storage_change()
{
var changes = new List<NotifyCollectionChangedEventArgs>();
var storage = new Storage(x => new ObservableStorage<TestStorageObject>(new MemoryStorage<TestStorageObject>()));
var collection = new StorageCollection<TestStorageObject>(storage, "0", "6");
collection.CollectionChanged += (sender, e) => { lock (changes) { changes.Add(e); } };
await collection.LoadMoreItemsAsync(10);
await Task.Delay(20);
Assert.Equal(0, changes.Count);
await Task.WhenAll(Enumerable.Range(5, 3).Select(x => storage.Add(new TestStorageObject(x))));
await Task.Delay(20);
Assert.Equal(1, changes.Count);
Assert.Equal(1, collection.Count);
changes.Clear();
await Task.WhenAll(Enumerable.Range(0, 8).Select(x => storage.Put(new TestStorageObject(x))));
await Task.Delay(20);
Assert.Equal(6, changes.Count);
Assert.Equal(6, collection.Count);
changes.Clear();
await Task.WhenAll(Enumerable.Range(4, 4).Select(x => storage.Put(new TestStorageObject(x))));
await Task.Delay(20);
Assert.Equal(2, changes.Count);
Assert.Equal(6, collection.Count);
changes.Clear();
await Task.WhenAll(Enumerable.Range(2, 6).Select(x => storage.Delete<TestStorageObject>(x.ToString())));
await Task.Delay(20);
Assert.Equal(4, changes.Count);
Assert.Equal(2, collection.Count);
changes.Clear();
}
