a test timeout ...

test/src/TestHelpers.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Threading.Tasks;
+
+namespace test {
+
+	public static class AssertAsync {
+
+		public static void CompletesIn(int timeout, Action action)
+		{
+			var task = Task.Run(action);
+			var completedInTime = Task.WaitAll(new[] { task }, TimeSpan.FromSeconds(timeout));
+
+			if (task.Exception != null)
+			{
+				if (task.Exception.InnerExceptions.Count == 1)
+				{
+					throw task.Exception.InnerExceptions[0];
+				}
+
+				throw task.Exception;
+			}
+
+			if (!completedInTime)
+			{
+				throw new TimeoutException($"Task did not complete in {timeout} seconds.");
+			}
+		}
+	}
+
+}
+
+
+