we pass this one

svn path=/trunk/mcs/; revision=106532

mcs/class/System.Core/Test/System.Linq/EnumerableMoreTest.cs

@@ -1543,7 +1543,6 @@ namespace MonoTests.System.Linq {
 		}
 
 		[Test]
-		[Category ("NotWorking")]
 		public void GroupJoinArgumentNullTest ()
 		{
 			string [] data = { "2", "1", "5", "3", "4" };