test rename overhaul: step 8 - language tests

tests/language/string_unicode2_negative_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 StringUnicode2NegativeTest {
 
   static testMain() {
     // \u{X*} should have 1-6 hex digits
     String str = "Foo\u{}Bar";
     str = "Foo\u{000000000}Bar";
     str = "Foo\u{DEAF!}Bar";
   }
 }
 
 main() {
   StringUnicode2NegativeTest.testMain();
 }