Move unittest tests underneath it in /pkg

pkg/unittest/tests/mock_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library('unittestTest');
 #import('../../../pkg/unittest/unittest.dart');
 
 class MockList extends Mock implements List {
 }
 
@@ skipping 616 matching lines @@
     expect(log.logs, hasLength(6));
     expect(log.logs.every((e) => e.mockName == 'm2' || e.mockName == 'm3'),
         isTrue);
     m2.clearLogs();
     expect(log.logs, hasLength(3));
     expect(log.logs.every((e) => e.mockName =='m3'), isTrue);
     m3.clearLogs();
     expect(log.logs, hasLength(0));
   });
 }