Migrated test block 14 to Dart 2.0.

tests/corelib_2/list_literal_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.
 
 import "package:expect/expect.dart";
 
 // Test that a list literal is expandable and modifiable.
 
 class ListLiteralTest {
   static void testMain() {
     var list = [1, 2, 3];
     Expect.equals(3, list.length);
     list.add(4);
     Expect.equals(4, list.length);
     list.addAll([5, 6]);
     Expect.equals(6, list.length);
     list[0] = 0;
     Expect.equals(0, list[0]);
   }
 }
 
 main() {
   ListLiteralTest.testMain();
 }