[devil] Upgrade parser/serializer for command line flags

devil/devil/android/file_changer_test.py

-#!/usr/bin/env python
-# Copyright 2017 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 posixpath
-import unittest
-
-from devil.android import flag_changer
-
-
-_CMDLINE_FILE = 'chrome-command-line'
-
-
-class _FakeDevice(object):
-  def __init__(self):
-    self.build_type = 'user'
-    self.has_root = True
-    self.file_system = {}
-
-  def HasRoot(self):
-    return self.has_root
-
-  def PathExists(self, filepath):
-    return filepath in self.file_system
-
-  def RemovePath(self, path, **_kwargs):
-    self.file_system.pop(path)
-
-  def WriteFile(self, path, contents, **_kwargs):
-    self.file_system[path] = contents
-
-  def ReadFile(self, path, **_kwargs):
-    return self.file_system[path]
-
-
-class FlagChangerTest(unittest.TestCase):
-  def setUp(self):
-    self.device = _FakeDevice()
-    # pylint: disable=protected-access
-    self.cmdline_path = posixpath.join(flag_changer._CMDLINE_DIR, _CMDLINE_FILE)
-    self.cmdline_path_legacy = posixpath.join(
-        flag_changer._CMDLINE_DIR_LEGACY, _CMDLINE_FILE)
-
-  def testFlagChanger_removeLegacyCmdLine(self):
-    self.device.WriteFile(self.cmdline_path_legacy, 'chrome --old --stuff')
-    self.assertTrue(self.device.PathExists(self.cmdline_path_legacy))
-
-    changer = flag_changer.FlagChanger(self.device, 'chrome-command-line')
-    self.assertEquals(
-        changer._cmdline_path,  # pylint: disable=protected-access
-        self.cmdline_path)
-    self.assertFalse(self.device.PathExists(self.cmdline_path_legacy))
-
-
-if __name__ == '__main__':
-  unittest.main(verbosity=2)