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

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

Index: utils/tests/pub/install/path/relative_path_test.dart
diff --git a/utils/tests/pub/install/path/relative_path_test.dart b/utils/tests/pub/install/path/relative_path_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..56fe28a061b98c8c1e7aaec8fa79911662db9380
--- /dev/null
+++ b/utils/tests/pub/install/path/relative_path_test.dart
@@ -0,0 +1,25 @@
+// 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 '../../../../pub/exit_codes.dart' as exit_codes;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration('path dependencies cannot use relative paths', () {
+    dir(appPath, [
+      pubspec({
+        "name": "myapp",
+        "dependencies": {
+          "foo": {"path": "../foo"}
+        }
+      })
+    ]).scheduleCreate();
+
+    schedulePub(args: ['install'],
+        error: new RegExp("Path dependency for package 'foo' must be an "
+                          "absolute path. Was '../foo'."),
+        exitCode: exit_codes.DATA);
+  });
+}