Enables codegen support in polymer

pkg/polymer/test/build/common.dart

 // Copyright (c) 2013, 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.
 
 library polymer.test.build.common;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:stack_trace/stack_trace.dart';
@@ skipping 18 matching lines @@
   final Iterable<String> packages;
   final List<String> messages;
   int messagesSeen = 0;
   bool errorSeen = false;
 
   Barback barback;
   var errorSubscription;
   var resultSubscription;
   var logSubscription;
 
-  Future<Asset> getAsset(AssetId id) =>
-      new Future.value(new Asset.fromString(id, files[idToString(id)]));
+  Future<Asset> getAsset(AssetId id) {
+    var content = files[idToString(id)];
+    if (content == null) fail('error: requested $id, but $id is not available');
+    return new Future.value(new Asset.fromString(id, content));
+  }
 
   TestHelper(List<List<Transformer>> transformers, Map<String, String> files,
       this.messages)
       : files = files,
         packages = files.keys.map((s) => idFromString(s).package) {
     barback = new Barback(this);
     for (var p in packages) {
       barback.updateTransformers(p, transformers);
     }
 
@@ skipping 66 matching lines @@
       if (messages == null) return;
       expect(messages.length, messagesSeen,
           reason: 'less messages than expected');
     });
   }
 }
 
 testPhases(String testName, List<List<Transformer>> phases,
     Map<String, String> inputFiles, Map<String, String> expectedFiles,
     [List<String> expectedMessages, bool solo = false]) {
+
+  // Include mock versions of the polymer library that can be used to test
+  // resolver-based code generation.
+  POLYMER_MOCKS.forEach((file, contents) { inputFiles[file] = contents; });
   (solo ? solo_test : test)(testName, () {
     var helper = new TestHelper(phases, inputFiles, expectedMessages)..run();
     return helper.checkAll(expectedFiles).whenComplete(() => helper.tearDown());
   });
 }
 
 const WEB_COMPONENTS_TAG =
     '<script src="packages/web_components/platform.js"></script>\n'
     '<script src="packages/web_components/dart_support.js"></script>\n';
 
 const INTEROP_TAG = '<script src="packages/browser/interop.js"></script>\n';
 const DART_JS_TAG = '<script src="packages/browser/dart.js"></script>';
 
+const POLYMER_MOCKS = const {
+  'polymer|lib/polymer.dart':
+      'library polymer;\n'
+      'import "dart:html";\n'
+      'export "package:observe/observe.dart";\n' // for @observable
+      'part "src/loader.dart";\n'  // for @CustomTag and @initMethod
+      'part "src/instance.dart";\n', // for @published and @ObserveProperty
+
+  'polymer|lib/src/loader.dart':
+      'part of polymer;\n'
+      'class CustomTag {\n'
+      '  final String tagName;\n'
+      '  const CustomTag(this.tagName);'
+      '}\n'
+      'class InitMethodAnnotation { const InitMethodAnnotation(); }\n'
+      'const initMethod = const InitMethodAnnotation();\n',
+
+  'polymer|lib/src/instance.dart':
+      'part of polymer;\n'
+      'class PublishedProperty { const PublishedProperty(); }\n'
+      'const published = const PublishedProperty();\n'
+      'class ObserveProperty { const ObserveProperty(); }\n'
+      'abstract class Polymer {}\n'
+      'class PolymerElement extends HtmlElement with Polymer {}\n',
+
+  'polymer|lib/init.dart':
+      'library polymer.init;\n'
+      'import "package:polymer/polymer.dart";\n'
+      'main() {};\n',
+
+  'observe|lib/observe.dart':
+      'library observe;\n'
+      'export "src/metadata.dart";',
+
+  'observe|lib/src/metadata.dart':
+      'library observe.src.metadata;\n'
+      'class ObservableProperty { const ObservableProperty(); }\n'
+      'const observable = const ObservableProperty();\n',
+};