diff --git a/proto/test/user_pb2_test.py b/proto/test/user_pb2_test.py
new file mode 100644
index 0000000..c02b719
--- /dev/null
+++ b/proto/test/user_pb2_test.py
@@ -0,0 +1,29 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Tests for user_pb2 functions."""
+
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+
+import unittest
+
+from proto import user_pb2
+
+
+class UserPb2Test(unittest.TestCase):
+
+  def testUser_Defaults(self):
+    user = user_pb2.MakeUser(111)
+    self.assertEqual(111, user.user_id)
+    self.assertFalse(user.obscure_email)
+    self.assertIsNone(user.email)
+
+  def testUser_Everything(self):
+    user = user_pb2.MakeUser(111, email='user@example.com', obscure_email=True)
+    self.assertEqual(111, user.user_id)
+    self.assertTrue(user.obscure_email)
+    self.assertEqual('user@example.com', user.email)