Refactor unittests

tests/compiler/dart2js/serialization/resolved_ast_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 dart2js.serialization_resolved_ast_test;
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common/backend_api.dart';
 import 'package:compiler/src/common/names.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
-import 'memory_compiler.dart';
-import 'serialization_helper.dart';
-import 'serialization_test_data.dart';
-import 'serialization_test_helper.dart';
+import '../memory_compiler.dart';
+import 'helper.dart';
+import 'test_data.dart';
+import 'test_helper.dart';
 
 
 main(List<String> args) {
   Arguments arguments = new Arguments.from(args);
   asyncTest(() async {
     String serializedData = await serializeDartCore(
         arguments: arguments, serializeResolvedAst: true);
     if (arguments.filename != null) {
       Uri entryPoint = Uri.base.resolve(nativeToUriPath(arguments.filename));
       await check(serializedData, entryPoint);
@@ skipping 54 matching lines @@
 
   if (resolvedAst1 == null || resolvedAst2 == null) return;
 
   if (verbose) {
     print('Checking resolved asts for $member1 vs $member2');
   }
 
   testResolvedAstEquivalence(
       resolvedAst1, resolvedAst2, const CheckStrategy());
 }