Install barback from a hosted source in all tests.

test/transformer/multiple_transformers_reject_their_config_test.dart

 // Copyright (c) 2014, 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 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
@@ skipping 11 matching lines @@
   }
 
   Future<bool> isPrimary(_) => new Future.value(true);
   Future apply(Transform transform) {}
 }
 """;
 
 main() {
     integration("multiple transformers in the same phase reject their "
         "configurations", () {
+      serveBarback();
+
       d.dir(appPath, [
         d.pubspec({
           "name": "myapp",
           "transformers": [[
             {"myapp/src/transformer": {'foo': 'bar'}},
             {"myapp/src/transformer": {'baz': 'bang'}},
             {"myapp/src/transformer": {'qux': 'fblthp'}}
-          ]]
+          ]],
+          "dependencies": {"barback": "any"}
         }),
         d.dir("lib", [d.dir("src", [
           d.file("transformer.dart", REJECT_CONFIG_TRANSFORMER)
         ])])
       ]).create();
 
-      createLockFile('myapp', pkg: ['barback']);
-
+      pubGet();
       // We should see three instances of the error message, once for each
       // use of the transformer.
       var pub = startPubServe();
       for (var i = 0; i < 3; i++) {
         pub.stderr.expect(consumeThrough(endsWith('Error loading transformer: '
             'I hate these settings!')));
       }
       pub.shouldExit(1);
     });
 }