Switch devenv to use pkg packages

lib/naclports/tests/test_installed_package.py

 # Copyright 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from mock import call, patch, Mock
 
 import common
 from naclports import package
 
 test_info = '''\
@@ skipping 11 matching lines @@
   file_mock = common.MockFileObject(test_info)
   with patch('__builtin__.open', Mock(return_value=file_mock), create=True):
     return package.InstalledPackage('dummy_file')
 
 
 class TestInstalledPackage(common.NaclportsTest):
 
   @patch('naclports.package.Log', Mock())
   @patch('naclports.package.RemoveFile')
   @patch('os.path.lexists', Mock(return_value=True))
+  @patch('os.path.exists', Mock(return_value=True))
   def testUninstall(self, remove_patch):  # pylint: disable=no-self-use
     pkg = CreateMockInstalledPackage()
     pkg.Files = Mock(return_value=['f1', 'f2'])
     pkg.Uninstall()
 
     # Assert that exactly 4 files we removed using RemoveFile
     calls = [call('/package/install/path/var/lib/npkg/foo.info'),
              call('/package/install/path/f1'),
              call('/package/install/path/f2'),
              call('/package/install/path/var/lib/npkg/foo.list')]
     remove_patch.assert_has_calls(calls)