PRESUBMIT_test_mocks.py

# Copyright 2014 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 json
import os
import re
import subprocess
import sys


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.json = json
    self.re = re
    self.os_path = os.path
    self.platform = sys.platform
    self.python_executable = sys.executable
    self.platform = sys.platform
    self.subprocess = subprocess
    self.files = []
    self.is_committing = False
    self.change = MockChange([])
    self.presubmit_local_path = os.path.dirname(__file__)

  def AffectedFiles(self, file_filter=None, include_deletes=False):
    return self.files

  def AffectedSourceFiles(self, file_filter=None):
    return self.files

  def LocalPaths(self):
    return self.files

  def PresubmitLocalPath(self):
    return self.presubmit_local_path

  def ReadFile(self, filename, mode='rU'):
    if hasattr(filename, 'AbsoluteLocalPath'):
       filename = filename.AbsoluteLocalPath()
    for file_ in self.files:
      if file_.LocalPath() == filename:
        return '\n'.join(file_.NewContents())
    # 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 PresubmitPromptWarning(PresubmitResult):
    def __init__(self, message, items=None, long_text=''):
      MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
      self.type = 'warning'

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

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


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, new_contents, action='A'):
    self._local_path = local_path
    self._new_contents = new_contents
    self._changed_contents = [(i + 1, l) for i, l in enumerate(new_contents)]
    self._action = action
    self._scm_diff = "--- /dev/null\n+++ %s\n@@ -0,0 +1,%d @@\n" % (local_path,
      len(new_contents))
    for l in new_contents:
      self._scm_diff += "+%s\n" % l

  def Action(self):
    return self._action

  def ChangedContents(self):
    return self._changed_contents

  def NewContents(self):
    return self._new_contents

  def LocalPath(self):
    return self._local_path

  def AbsoluteLocalPath(self):
    return self._local_path

  def GenerateScmDiff(self):
    return self._scm_diff

  def rfind(self, p):
    """os.path.basename is called on MockFile so we need an rfind method."""
    return self._local_path.rfind(p)

  def __getitem__(self, i):
    """os.path.basename is called on MockFile so we need a get method."""
    return self._local_path[i]

  def __len__(self):
    """os.path.basename is called on MockFile so we need a len method."""
    return len(self._local_path)


class MockAffectedFile(MockFile):
  def AbsoluteLocalPath(self):
    return self._local_path


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

  def LocalPaths(self):
    return self._changed_files

  def AffectedFiles(self, include_dirs=False, include_deletes=True,
                    file_filter=None):
    return self._changed_files