Wait

Wait.cs

public static class Wait
{
	public static bool ForExpectedValue<T>(T expectation, Func<T> source, int millisecondPolling = 500, int timeoutInMilliseconds = 5000)
	{
		var matched = Wait.Until(() => expectation.Equals(source()), millisecondPolling, timeoutInMilliseconds).WasSatisfied;

		StoryTellerAssert.Fail(!matched, () => "Expected {0}, but was {1}".ToFormat(expectation, source()));

		return true;
	}


	public static Satisfied Until(Func<bool> condition, int millisecondPolling = 500, int timeoutInMilliseconds = 5000)
	{
		if (condition()) return new Satisfied(true);


		var returnValue = false;

		var clock = new Stopwatch();
		clock.Start();

		var reset = new ManualResetEvent(false);

		ThreadPool.QueueUserWorkItem(o =>
		{
			while (true)
			{
				try
				{
					if (condition())
					{
						returnValue = true;
						break;
					}
				}
				catch (Exception)
				{
					// Yeah, that's right.  I wanna swallow these exceptions
				}
			
				Thread.Sleep(100);
			}

			reset.Set();
		});



		reset.WaitOne(timeoutInMilliseconds);
		
		return new Satisfied(returnValue);
	}

	public class Satisfied
	{
		private readonly bool _returnValue;

		public Satisfied(bool returnValue)
		{
			_returnValue = returnValue;
		}

		public bool WasSatisfied
		{
			get
			{
				return _returnValue;
			}
		}
	}
}