Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Threading.Tasks.Dataflow/Test/AssertEx.cs

@@ -0,0 +1,22 @@
+using System;
+using NUnit.Framework;
+
+namespace MonoTests {
+	static class AssertEx {
+		static public T Throws<T> (Action code) where T : Exception
+		{
+			T exception = null;
+			try {
+				code ();
+			} catch (T ex) {
+				exception = ex;
+			}
+
+			Assert.IsNotNull (exception);
+			// to check for exact type
+			Assert.AreEqual(typeof(T), exception.GetType ());
+
+			return exception;
+		}
+	}
+}