test rename overhaul: step 8 - language tests

tests/language/hello_dart_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.
 // Simple test program invoked with an option to eagerly
 // compile all code that is loaded in the isolate.
 // VMOptions=--compile_all
 
 class HelloDartTest {
   static testMain() {
     print("Hello, Darter!");
   }
 }
 
 
 main() {
   HelloDartTest.testMain();
 }