test rename overhaul: step 7 - corelib tests

tests/corelib/unicode_test.dart

 // Copyright (c) 2011, 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.
 
 class UnicodeTest {
 
   static testMain() {
     var lowerStrasse =
         new String.fromCharCodes([115, 116, 114, 97, 223, 101]);
     Expect.equals("STRASSE", lowerStrasse.toUpperCase());
   }
 }
 
 main() {
   UnicodeTest.testMain();
 }