public async Task PushAsynGetAsyncEnumeratorAndCompleteAsync_SomeMessages_MessagesPushedAndReceived()
{
var stream = new MessageStreamEnumerable <int>();
var success = false;
var enumerationTask = Task.Run(
async() =>
{
var enumerator = stream.GetAsyncEnumerator();
(await enumerator.MoveNextAsync()).Should().BeTrue();
enumerator.Current.Should().Be(1);
(await enumerator.MoveNextAsync()).Should().BeTrue();
enumerator.Current.Should().Be(2);
(await enumerator.MoveNextAsync()).Should().BeTrue();
enumerator.Current.Should().Be(3);
(await enumerator.MoveNextAsync()).Should().BeFalse();
success = true;
});
await stream.PushAsync(new PushedMessage(1, 1));
await stream.PushAsync(new PushedMessage(2, 2));
await stream.PushAsync(new PushedMessage(3, 3));
await stream.CompleteAsync();
await enumerationTask;
success.Should().BeTrue();
}
public async Task CompleteAsync_WhileEnumerating_EnumerationCompleted()
{
var completed = false;
var stream = new MessageStreamEnumerable <int>();
using var enumerator = stream.GetEnumerator();
// The next MoveNext reaches the end of the enumerable
// ReSharper disable once AccessToDisposedClosure
Task.Run(
() =>
{
enumerator.MoveNext();
completed = true;
}).FireAndForget();
completed.Should().BeFalse();
await stream.CompleteAsync();
// Give the other thread a chance to exit the MoveNext
await AsyncTestingUtil.WaitAsync(() => completed);
completed.Should().BeTrue();
}
public async Task CompleteAsync_TryPushingAfterComplete_ExceptionThrown()
{
var stream = new MessageStreamEnumerable <int>();
await stream.CompleteAsync();
Func <Task> act = async() => await stream.PushAsync(new PushedMessage(1, 1));
act.Should().Throw <InvalidOperationException>();
}
public async Task CompleteAsync_WhileAsyncEnumerating_EnumerationCompleted()
{
var completed = false;
var stream = new MessageStreamEnumerable <int>();
var enumerator = stream.GetAsyncEnumerator();
// The next MoveNext reaches the end of the enumerable
Task.Run(
async() =>
{
await enumerator.MoveNextAsync();
completed = true;
}).FireAndForget();
completed.Should().BeFalse();
await stream.CompleteAsync();
// Give the other thread a chance to exit the MoveNext
await AsyncTestingUtil.WaitAsync(() => completed);
completed.Should().BeTrue();
}