Migrate block 115.

tests/language_2/hello_script_test.dart

 #! This is currently only a comment.
 // 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.
 
 // Testing a simple script importing a library.
 // This file contains the script (aka root library).
 
 library HelloScriptTest.dart;
 
 import "package:expect/expect.dart";
 import "hello_script_lib.dart";
 
 main() {
   HelloLib.doTest();
   Expect.equals(18, x);
   print("Hello done.");
 }