Install barback from a hosted source in all tests.

test/run/displays_transformer_logs_test.dart

 // Copyright (c) 2014, 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.
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const SCRIPT = """
 import "package:myapp/lib.dart";
 main() {
@@ skipping 28 matching lines @@
 
   void declareOutputs(DeclaringTransform transform) {
     // TODO(rnystrom): Remove this when #19408 is fixed.
     transform.declareOutput(transform.primaryId);
   }
 }
 """;
 
 main() {
   integration('displays transformer log messages', () {
+    serveBarback();
+
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
-        "transformers": ["myapp/src/transformer"]
+        "transformers": ["myapp/src/transformer"],
+        "dependencies": {"barback": "any"}
       }),
       d.dir("lib", [
         d.file("lib.dart", LIB),
         d.dir("src", [
           d.file("transformer.dart", TRANSFORMER)
         ])
       ]),
       d.dir("bin", [
         d.file("script.dart", SCRIPT)
       ])
     ]).create();
 
-    createLockFile('myapp', pkg: ['barback']);
-
+    pubGet();
     var pub = pubRun(args: ["bin/script"]);
 
     // Note that the info log is only displayed here because the test
     // harness runs pub in verbose mode. By default, only the warning would
     // be shown.
     pub.stdout.expect("[Info from Logging]:");
     pub.stdout.expect("myapp|bin/script.dart.");
 
     pub.stderr.expect("[Warning from Logging]:");
     pub.stderr.expect("myapp|bin/script.dart.");
 
     pub.stdout.expect("[Info from Logging]:");
     pub.stdout.expect("myapp|lib/lib.dart.");
 
     pub.stderr.expect("[Warning from Logging]:");
     pub.stderr.expect("myapp|lib/lib.dart.");
 
     pub.stdout.expect("lib");
     pub.shouldExit();
   });
 }