diff --git a/tests/super_mox.py b/tests/super_mox.py
new file mode 100644
index 0000000000..6102170c47
--- /dev/null
+++ b/tests/super_mox.py
@@ -0,0 +1,91 @@
+#!/usr/bin/python
+# Copyright (c) 2009 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.
+
+"""Simplify unit tests based on pymox."""
+
+import os
+import random
+import string
+
+mox = None
+
+def OnTestsLoad():
+  import sys
+  old_path = sys.path
+  global mox
+  try:
+    directory, _file = os.path.split(__file__)
+    sys.path.append(os.path.abspath(os.path.join(directory, 'pymox')))
+    sys.path.append(os.path.abspath(os.path.join(directory, '..')))
+    try:
+      import mox as Mox
+      mox = Mox
+    except ImportError:
+      print "Trying to automatically checkout pymox."
+      import subprocess
+      subprocess.call(['svn', 'co', 'http://pymox.googlecode.com/svn/trunk',
+                       os.path.join(directory, 'pymox')],
+                      shell=True)
+      try:
+        import mox as Mox
+        mox = Mox
+      except ImportError:
+        print >> sys.stderr, ("\nError, failed to load pymox\n")
+        raise
+  finally:
+    # Restore the path
+    sys.path = old_path
+
+
+# Automatically fetch pymox.
+OnTestsLoad()
+
+
+class SuperMoxTestBase(mox.MoxTestBase):
+  # Backup the separator in case it gets mocked
+  _OS_SEP = os.sep
+  _RANDOM_CHOICE = random.choice
+  _RANDOM_RANDINT = random.randint
+  _STRING_LETTERS = string.letters
+
+  ## Some utilities for generating arbitrary arguments.
+  def String(self, max_length):
+    return ''.join([self._RANDOM_CHOICE(self._STRING_LETTERS)
+                    for x in xrange(self._RANDOM_RANDINT(1, max_length))])
+
+  def Strings(self, max_arg_count, max_arg_length):
+    return [self.String(max_arg_length) for x in xrange(max_arg_count)]
+
+  def Args(self, max_arg_count=8, max_arg_length=16):
+    return self.Strings(max_arg_count,
+                        self._RANDOM_RANDINT(1, max_arg_length))
+
+  def _DirElts(self, max_elt_count=4, max_elt_length=8):
+    return self._OS_SEP.join(self.Strings(max_elt_count, max_elt_length))
+
+  def Dir(self, max_elt_count=4, max_elt_length=8):
+    return (self._RANDOM_CHOICE((self._OS_SEP, '')) +
+            self._DirElts(max_elt_count, max_elt_length))
+
+  def Url(self, max_elt_count=4, max_elt_length=8):
+    return ('svn://random_host:port/a' +
+            self._DirElts(max_elt_count, max_elt_length
+                ).replace(self._OS_SEP, '/'))
+
+  def RootDir(self, max_elt_count=4, max_elt_length=8):
+    return self._OS_SEP + self._DirElts(max_elt_count, max_elt_length)
+
+  def compareMembers(self, object, members):
+    """If you add a member, be sure to add the relevant test!"""
+    # Skip over members starting with '_' since they are usually not meant to
+    # be for public use.
+    actual_members = [x for x in sorted(dir(object))
+                      if not x.startswith('_')]
+    expected_members = sorted(members)
+    if actual_members != expected_members:
+      diff = ([i for i in actual_members if i not in expected_members] +
+              [i for i in expected_members if i not in actual_members])
+      print diff
+    self.assertEqual(actual_members, expected_members)