[NaCl SDK] Fix zip_test failure on mac buildbots.

native_client_sdk/src/tools/zip_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 import os
 import oshelpers
 import shutil
 import subprocess
 import sys
@@ skipping 86 matching lines @@
     self.MakeFile('file2', 3354)
     self.RunZip([self.zipname, 'file*'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 2)
 
   def testAddDir(self):
     os.mkdir(self.GetTempPath('dir1'))
     self.RunZip([self.zipname, 'dir1'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 1)
+    self.assertRaises(KeyError, self.zipfile.getinfo, 'dir1')
+    self.zipfile.getinfo('dir1/')
 
   def testAddRecursive(self):
     os.mkdir(self.GetTempPath('dir1'))
     self.MakeFile(os.path.join('dir1', 'file1'), 256)
     os.mkdir(self.GetTempPath(os.path.join('dir1', 'dir2')))
     self.MakeFile(os.path.join('dir1', 'dir2', 'file2'), 1234)
     self.RunZip([self.zipname, '-r', 'dir1'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 4)
 
@@ skipping 58 matching lines @@
     self.CloseZipFile()
 
     file3 = self.MakeFile('file3', 768)
     self.RunZip([self.zipname, file3])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 3)
 
 
 if __name__ == '__main__':
   unittest.main()