public async Task WhenCallingAsyncMethod_ShouldSucceedWhenChannelReachesDetached()
{
SetState(ChannelState.Attached);
var detachTask = _channel.DetachAsync();
await Task.WhenAll(detachTask, ReceiveDetachedMessage());
detachTask.Result.IsSuccess.Should().BeTrue();
detachTask.Result.Error.Should().BeNull();
}