Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 '../descriptor.dart' as d;
-import '../test_pub.dart';
-import '../serve/utils.dart';
-
-/// The code for a transformer that renames ".js" files to ".out".
-const JS_REWRITE_TRANSFORMER = """
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-
-class RewriteTransformer extends Transformer {
-  RewriteTransformer.asPlugin();
-
-  String get allowedExtensions => '.js';
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".out");
-      transform.addOutput(new Asset.fromString(id, contents));
-    });
-  }
-}
-""";
-
-main() {
-  initConfig();
-  withBarbackVersions("any", () {
-    integration("output can be consumed by successive phases", () {
-      d.dir(appPath, [
-        d.pubspec({
-          "name": "myapp",
-          "transformers": ["\$dart2js", "myapp/src/transformer"]
-        }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", JS_REWRITE_TRANSFORMER)
-        ])]),
-        d.dir("web", [d.file("main.dart", "void main() {}")])
-      ]).create();
-
-      createLockFile('myapp', pkg: ['barback']);
-
-      pubServe();
-      requestShouldSucceed("main.dart.out", isUnminifiedDart2JSOutput);
-      endPubServe();
-    });
-  });
-}