Fix a bug in barback's static package handling.

pkg/barback/test/static_provider_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.
 
 library barback.test.static_provider_test;
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import 'utils.dart';
 
@@ skipping 13 matching lines @@
   test("a transformer can see a static asset", () {
     initStaticGraph({
       "static|b.inc": "b",
       "app|a.txt": "static|b.inc"
     }, staticPackages: ["static"], transformers: {
       "app": [[new ManyToOneTransformer("txt")]]
     });
     updateSources(["app|a.txt"]);
     expectAsset("app|a.out", "b");
   });
+
+  test("can list all static assets", () {
+    initStaticGraph(["app|foo.txt", "app|bar.txt", "app|baz.txt"],
+        staticPackages: ["app"]);
+    expectAllAssets(["app|foo.txt", "app|bar.txt", "app|baz.txt"]);
+  });
 }