public async Task WhenHandlingAnything_ThenDelaysTheSpecifiedDuration()
{
var duration = TimeSpan.FromSeconds(2);
var handler = new LongRunningHandler(duration);
var context = new ProcessingContext("", "", "");
var body = new byte[] { };
var headers = new Dictionary <string, string>();
await AssertExt.TaskRanForAtLeast(() => handler.ExecuteAsync(context, body, headers), duration);
}