chrome/test/mini_installer/file_verifier.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import os
   6
   7 import verifier
   8
   9
  10 class FileVerifier(verifier.Verifier):
  11   """Verifies that the current files match the expectation dictionaries."""
  12
  13   def _VerifyExpectation(self, expectation_name, expectation,
  14                          variable_expander):
  15     """Overridden from verifier.Verifier.
  16
  17     This method will throw an AssertionError if file state doesn't match the
  18     |expectation|.
  19
  20     Args:
  21       expectation_name: Path to the file being verified. It is expanded using
  22           Expand.
  23       expectation: A dictionary with the following key and value:
  24           'exists' a boolean indicating whether the file should exist.
  25       variable_expander: A VariableExpander object.
  26     """
  27     file_path = variable_expander.Expand(expectation_name)
  28     file_exists = os.path.exists(file_path)
  29     assert expectation['exists'] == file_exists, \
  30         ('File %s exists' % file_path) if file_exists else \
  31         ('File %s is missing' % file_path)