Refactor unittests

tests/compiler/dart2js/serialization_impact_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_impact_test;
-
-import 'dart:async';
-import 'package:async_helper/async_helper.dart';
-import 'package:compiler/src/commandline_options.dart';
-import 'package:compiler/src/common/resolution.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_helper.dart';
-
-main(List<String> args) {
-  Arguments arguments = new Arguments.from(args);
-  asyncTest(() async {
-    String serializedData = await serializeDartCore(arguments: arguments);
-    if (arguments.filename != null) {
-      Uri entryPoint = Uri.base.resolve(nativeToUriPath(arguments.filename));
-      await check(serializedData, entryPoint);
-    } else {
-      Uri entryPoint = Uri.parse('memory:main.dart');
-      await check(serializedData, entryPoint,
-                  sourceFiles:  {'main.dart': 'main() {}'},
-                  verbose: arguments.verbose);
-    }
-  });
-}
-
-Future check(
-  String serializedData,
-  Uri entryPoint,
-  {Map<String, String> sourceFiles: const <String, String>{},
-   bool verbose: false}) async {
-
-  Compiler compilerNormal = compilerFor(
-      memorySourceFiles: sourceFiles,
-      options: [Flags.analyzeAll]);
-  compilerNormal.resolution.retainCachesForTesting = true;
-  await compilerNormal.run(entryPoint);
-
-  Compiler compilerDeserialized = compilerFor(
-      memorySourceFiles: sourceFiles,
-      options: [Flags.analyzeAll]);
-  compilerDeserialized.resolution.retainCachesForTesting = true;
-  deserialize(compilerDeserialized, serializedData);
-  await compilerDeserialized.run(entryPoint);
-
-  checkAllImpacts(compilerNormal, compilerDeserialized, verbose: verbose);
-}