e2e test for transformer (webdriver + pub serve)

test/transformer_test.dart

+// Copyright (c) 2016, 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 dev_compiler.test.transformer.transformer_test;
 
 import 'package:barback/barback.dart' show BarbackMode, BarbackSettings;
 import 'package:dev_compiler/transformer.dart';
 import 'package:dev_compiler/src/compiler.dart' show defaultRuntimeFiles;
 import 'package:test/test.dart';
 import 'package:transformer_test/utils.dart';
 
 makePhases([Map config = const {}]) => [
       [
@@ skipping 76 matching lines @@
             }
           '''
         }),
         {},
         [
           "warning: A value of type \'String\' cannot be assigned to a variable of type \'int\' (package:foo/Foo.dart 3 19)",
           "error: Type check failed: '2' (String) is not of type int (package:foo/Foo.dart 3 19)"
         ]);
   });
 }