Generate mock libraries and assert that helpers are non-null.

tests/compiler/dart2js/patch_test.dart

 // Copyright (c) 2012, 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 'dart:async';
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import "package:compiler/implementation/dart2jslib.dart";
 import "package:compiler/implementation/elements/elements.dart";
 import "package:compiler/implementation/tree/tree.dart";
 import "package:compiler/implementation/util/util.dart";
 import "mock_compiler.dart";
+import "mock_libraries.dart";
 import "parser_helper.dart";
 
 Future<Compiler> applyPatch(String script, String patch,
                             {bool analyzeAll: false, bool analyzeOnly: false}) {
-  String core = "$DEFAULT_CORELIB\n$script";
+  Map<String, String> core = <String, String>{'script': script};
   MockCompiler compiler = new MockCompiler.internal(coreSource: core,
                                                     analyzeAll: analyzeAll,
                                                     analyzeOnly: analyzeOnly);
   var uri = Uri.parse("patch:core");
-  compiler.registerSource(uri, "$PATCH_CORE_SOURCE\n$patch");
+  compiler.registerSource(uri, "$DEFAULT_PATCH_CORE_SOURCE\n$patch");
   return compiler.init().then((_) => compiler);
 }
 
 void expectHasBody(compiler, Element element) {
     var node = element.parseNode(compiler);
     Expect.isNotNull(node, "Element isn't parseable, when a body was expected");
     Expect.isNotNull(node.body);
     // If the element has a body it is either a Block or a Return statement,
     // both with different begin and end tokens.
     Expect.isTrue(node.body is Block || node.body is Return);
@@ skipping 847 matching lines @@
   testPatchNoGetter();
   testPatchNonSetter();
   testPatchNoSetter();
   testPatchNonFunction();
 
   testPatchAndSelector();
 
   testAnalyzeAllInjectedMembers();
   testTypecheckPatchedMembers();
 }