presubmit_test_mocks.py

# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

# This file is inspired to [1].
# [1] - https://cs.chromium.org/chromium/src/PRESUBMIT_test_mocks.py


class MockInputApi(object):
  """Mock class for the InputApi class.

  This class can be used for unittests for presubmit by initializing the files
  attribute as the list of changed files.
  """

  def __init__(self):
    self.change = MockChange([])
    self.files = []

  def AffectedSourceFiles(self, file_filter=None):
    # pylint: disable=unused-argument
    return self.files

  def ReadFile(self, affected_file, mode='rU'):
    filename = affected_file.AbsoluteLocalPath()
    for f in self.files:
      if f.LocalPath() == filename:
        with open(filename, mode) as f:
          return f.read()
    # Otherwise, file is not in our mock API.
    raise IOError, "No such file or directory: '%s'" % filename


class MockOutputApi(object):
  """Mock class for the OutputApi class.

  An instance of this class can be passed to presubmit unittests for outputing
  various types of results.
  """

  class PresubmitResult(object):
    def __init__(self, message, items=None, long_text=''):
      self.message = message
      self.items = items
      self.long_text = long_text

    def __repr__(self):
      return self.message

  class PresubmitError(PresubmitResult):
    def __init__(self, message, items=None, long_text=''):
      MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
      self.type = 'error'


class MockChange(object):
  """Mock class for Change class.

  This class can be used in presubmit unittests to mock the query of the
  current change.
  """

  def __init__(self, changed_files):
    self._changed_files = changed_files


class MockFile(object):
  """Mock class for the File class.

  This class can be used to form the mock list of changed files in
  MockInputApi for presubmit unittests.
  """

  def __init__(self, local_path):
    self._local_path = local_path

  def LocalPath(self):
    return self._local_path

  def AbsoluteLocalPath(self):
    return self._local_path