Add more python 2.5 compatibility.

tests/scm_unittest.py

-#!/usr/bin/python
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python
+# Copyright (c) 2011 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.
 
 """Unit tests for scm.py."""
 
 # pylint: disable=E1101,W0403
+from __future__ import with_statement
+import logging
+import sys
+import unittest
 
 # Fixes include path.
 from super_mox import SuperMoxTestBase
 
 import fake_repos
 import scm
 
 
 class BaseTestCase(SuperMoxTestBase):
   # Like unittest's assertRaises, but checks for Gclient.Error.
@@ skipping 299 matching lines @@
 
     scm.SVN.Revert(self.svn_root)
     self._capture(['update', '--revision', 'base'])
 
     self.assertTree(self.tree, self.svn_root)
     # Asserting the tree is not sufficient, svn status must come out clear too.
     self.assertEquals('', self._capture(['status']))
 
 
 if __name__ == '__main__':
-  import unittest
+  if '-v' in sys.argv:
+    logging.basicConfig(level=logging.DEBUG)
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: