public async Task TestSequentialEnumeratorAsync()
{
var start = MAX_ITEMS;
var completionState = new Int32[start];
var r = new Random();
MoveNextAsyncDelegate <Int32> moveNext = async() =>
{
var decremented = Interlocked.Decrement(ref start);
await Task.Delay(r.Next(100, 500));
return(decremented >= 0, MAX_ITEMS - decremented - 1);
};
var enumerable = AsyncEnumerationFactory.CreateSequentialEnumerable(() => AsyncEnumerationFactory.CreateSequentialStartInfo(
moveNext,
null
),
DefaultAsyncProvider.Instance);
Func <Int32, Task> callback = async idx =>
{
await Task.Delay(r.Next(100, 900));
Assert.IsTrue(completionState.Take(idx).All(s => s == 1));
Interlocked.Increment(ref completionState[idx]);
};
var itemsEncountered = await enumerable.EnumerateAsync(callback);
Assert.AreEqual(itemsEncountered, completionState.Length);
Assert.IsTrue(completionState.All(s => s == 1));
}