Add file permissions to filesystem_mock

third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 93 matching lines @@
                       'foo/a/y': '',
                       'foo/a/z/lyrics': '',
                       'foo/b': '',
                       'foo/c': ''}
         host = MockHost()
         host.filesystem = MockFileSystem(files=mock_files)
         self.assertEquals(host.filesystem.walk(mock_dir), [('foo', ['a', 'bar'], ['c', 'b']),
                                                            ('foo/a', ['z'], ['x', 'y']),
                                                            ('foo/a/z', [], ['lyrics']),
                                                            ('foo/bar', [], ['quux', 'baz'])])
+
+    def test_executable(self):
+        host = MockHost()
+        mock_files = {'foo': '', 'bar': ''}
+        host.filesystem = MockFileSystem(files=mock_files)
+        host.filesystem.executable_files.add('bar')
+        host.filesystem.make_executable('bar', 'foo')
+        self.assertEquals(host.filesystem.is_executable('foo'), True)