Fix error detection for a non-existent global script.

test/global/run/nonexistent_script_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 'package:path/path.dart' as p;
 import 'package:pub/src/exit_codes.dart' as exit_codes;
 
 import '../../test_pub.dart';
 
 main() {
   integration('errors if the script does not exist.', () {
-    servePackages((builder) => builder.serve("foo", "1.0.0"));
+    servePackages((builder) => builder.serve("foo", "1.0.0", pubspec: {
+      // Make sure barback doesn't try to look at *all* dependencies when
+      // determining which transformers to load.
+      "dev_dependencies": {"bar": "1.0.0"}
+    }));
 
     schedulePub(args: ["global", "activate", "foo"]);
 
     var pub = pubRun(global: true, args: ["foo:script"]);
-    pub.stderr.expect("Could not find ${p.join("bin", "script.dart")}.");
+    pub.stderr.expect(
+        "Could not find ${p.join("bin", "script.dart")} in package foo.");
     pub.shouldExit(exit_codes.NO_INPUT);
   });
 }