Take Sam Elkhateeb's path for "path" dependencies and clean it up some.

utils/tests/pub/install/path/nonexistent_dir_test.dart

+// Copyright (c) 2013, 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 'dart:io';
+
+import '../../../../../pkg/path/lib/path.dart' as path;
+
+import '../../../../pub/exit_codes.dart' as exit_codes;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration('path dependency to non-existent directory', () {
+    var badPath = path.join(sandboxDir, "bad_path");
+
+    dir(appPath, [
+      pubspec({
+        "name": "myapp",
+        "dependencies": {
+          "foo": {"path": badPath}
+        }
+      })
+    ]).scheduleCreate();
+
+    schedulePub(args: ['install'],
+        error:
+            new RegExp("Could not find package 'foo' at '$badPath'."),
+        exitCode: exit_codes.DATA);
+  });
+}