Install barback from a hosted source in all tests.

test/transformer/runs_a_transformer_on_a_dependency_test.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.
 
 library pub_tests;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
   integration("runs a local transformer on a dependency", () {
+    serveBarback();
+
     d.dir("foo", [
       d.pubspec({
         "name": "foo",
         "version": "0.0.1",
-        "transformers": ["foo/transformer"]
+        "transformers": ["foo/transformer"],
+        "dependencies": {"barback": "any"}
       }),
       d.dir("lib", [
         d.file("transformer.dart", REWRITE_TRANSFORMER),
         d.file("foo.txt", "foo")
       ])
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({"foo": {"path": "../foo"}}),
     ]).create();
 
-    createLockFile('myapp', sandbox: ['foo'], pkg: ['barback']);
-
+    pubGet();
     pubServe();
     requestShouldSucceed("packages/foo/foo.out", "foo.out");
     endPubServe();
   });
 }