tests/subcommand_test.py

#!/usr/bin/env vpython3
# Copyright (c) 2012 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 os
import sys
import unittest

if sys.version_info.major == 2:
  import mock
else:
  from unittest import mock

_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, _ROOT)

import subcommand


class SubcommandTest(unittest.TestCase):
  def setUp(self):
    super(SubcommandTest, self).setUp()
    self.module = mock.Mock(__doc__='Module documentation')
    self.parser = mock.Mock()
    self.sc = subcommand.CommandDispatcher(__name__)
    self.sc.module = self.module

  def testEnumerateCommands(self):
    self.module.CMDfoo_bar = object()
    self.module.CMDbaz = object()
    self.module.CMDaBcDeF_0123 = object()

    expected = {
      'foo-bar': self.module.CMDfoo_bar,
      'baz': self.module.CMDbaz,
      'aBcDeF-0123': self.module.CMDaBcDeF_0123,
      'help': subcommand.CMDhelp,
    }
    self.assertEqual(expected, self.sc.enumerate_commands())

  def testEnumerateCommands_CustomHelp(self):
    self.module.CMDhelp = object()
    self.assertEqual(
        {'help': self.module.CMDhelp}, self.sc.enumerate_commands())

  def testFindNearestCommand_ExactMatch(self):
    self.module.CMDfoo = object()
    self.assertEqual(
        self.module.CMDfoo, self.sc.find_nearest_command('foo'))

  def testFindNearestCommand_UniquePrefix(self):
    self.module.CMDfoo = object()
    self.module.CMDbar = object()
    self.module.CMDunique_prefix = object()
    self.assertEqual(
        self.module.CMDunique_prefix,
        self.sc.find_nearest_command('unique-pre'))

  def testFindNearestCommand_NonUniquePrefix(self):
    self.module.CMDprefix1 = object()
    self.module.CMDprefix2 = object()
    self.assertIsNone(self.sc.find_nearest_command('prefix'))

  def testFindNearestCommand_CloseEnough(self):
    self.module.CMDfoo = object()
    self.module.CMDbar = object()
    self.module.CMDclose_enough = object()
    self.assertEqual(
        self.module.CMDclose_enough,
        self.sc.find_nearest_command('clos-enough'))

  def testFindNearestCommand_TooManyCloseEnough(self):
    self.module.CMDcase_enough = object()
    self.module.CMDclose_enough = object()
    self.assertIsNone(self.sc.find_nearest_command('clase-enough'))

  def testFindNearestCommand_ClosestIsNotCloseEnough(self):
    self.module.CMDfoo = object()
    self.module.CMDbar = object()
    self.module.CMDnot_close_enough = object()
    self.assertIsNone(self.sc.find_nearest_command('clos-enof'))

  def _setUpTestCommands(self):
    self.module.CMDhelp = mock.Mock(
        __name__='CMDhelp',
        __doc__='help documentation',
        usage_more=None,
        return_value=0)
    self.module.CMDfoo = mock.Mock(
        __name__='CMDfoo',
        __doc__='foo documentation',
        usage_more='usage more',
        epilog='epilog',
        return_value=123)
    self.module.CMDbar_baz = mock.Mock(
        __name__='CMDbar_baz',
        __doc__='bar-baz documentation',
        usage_more=None,
        epilog=None,
        return_value=0)

  def testExecute(self):
    self._setUpTestCommands()

    self.assertEqual(
        123, self.sc.execute(self.parser, ['foo', '--bar', '--baz']))
    self.module.CMDfoo.assert_called_once_with(self.parser, ['--bar', '--baz'])
    self.assertEqual('foo documentation\n\n', self.parser.description)
    self.assertEqual('\nepilog\n', self.parser.epilog)
    self.parser.set_usage.assert_called_once_with(
        'usage: %prog foo [options] usage more')

  def testExecute_Help(self):
    self._setUpTestCommands()

    self.assertEqual(0, self.sc.execute(self.parser, ['--help']))
    self.module.CMDhelp.assert_called_once_with(self.parser, [])
    self.assertEqual(
        'Module documentation\n\n'
        'Commands are:\n'
        '  bar-baz bar-baz documentation\n'
        '  foo     foo documentation\n'
        '  help    help documentation\n',
        self.parser.description)
    self.parser.set_usage.assert_called_once_with(
        'usage: %prog <command> [options]')

  def testExecute_CommandHelp(self):
    self._setUpTestCommands()

    self.assertEqual(0, self.sc.execute(self.parser, ['help', 'bar-baz']))
    self.module.CMDbar_baz.assert_called_once_with(self.parser, ['--help'])
    self.assertEqual('bar-baz documentation\n\n', self.parser.description)
    self.parser.set_usage.assert_called_once_with(
        'usage: %prog bar-baz [options]')

  def testExecute_CommandNotFound(self):
    self._setUpTestCommands()

    self.assertEqual(0, self.sc.execute(self.parser, ['not-found']))
    self.module.CMDhelp.assert_called_once_with(self.parser, ['not-found'])
    self.assertEqual(
        'Module documentation\n\n'
        'Commands are:\n'
        '  bar-baz bar-baz documentation\n'
        '  foo     foo documentation\n'
        '  help    help documentation\n',
        self.parser.description)
    self.parser.set_usage.assert_called_once_with(
        'usage: %prog <command> [options]')

  def testExecute_CommandNotFoundAndHelpDisabled(self):
    self._setUpTestCommands()
    self.module.CMDhelp = None

    self.assertEqual(2, self.sc.execute(self.parser, ['not-found']))


if __name__ == '__main__':
  unittest.main()