avoid another visual tree of tests

svn path=/trunk/mcs/; revision=92523

mcs/class/System.Core/Test/System.Collections.Generic/HashSetTest.cs

@@ -33,7 +33,7 @@ using System.Linq;
 
 using NUnit.Framework;
 
-namespace Mono.Tests.System.Collections.Generic {
+namespace MonoTests.System.Collections.Generic {
 
 	[TestFixture]
 	public class HashSetTest {