cros/commands/command_unittest.py

#!/usr/bin/python

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""This module tests the command module."""

import argparse
import os
import sys
import unittest

sys.path.insert(0, os.path.abspath('%s/../../..' % os.path.dirname(__file__)))

from chromite.lib import cros_test_lib
from chromite.cros.commands import command

_COMMAND_NAME = 'superAwesomeCommandOfFunness'


@command.CommandDecorator(_COMMAND_NAME)
class TestCommand(command.CrosCommand):
  """A fake command."""
  def Run(self):
    print 'Just testing'


class CommandTest(unittest.TestCase):
  """This test class tests that Commands method."""

  def testParserSetsCrosClass(self):
    """Tests that our parser sets cros_class correctly."""
    my_parser = argparse.ArgumentParser()
    command.CrosCommand.AddParser(my_parser)
    ns = my_parser.parse_args([])
    self.assertEqual(ns.cros_class, command.CrosCommand)

  def testCommandDecorator(self):
    """Tests that our decorator correctly adds TestCommand to _commands."""
    # Note this exposes an implementation detail of _commands.
    self.assertEqual(command._commands[_COMMAND_NAME], TestCommand)

  def testBadUseOfCommandDecorator(self):
    """Tests that our decorator correctly rejects bad test commands."""
    try:
      @command.CommandDecorator('bad')
      class BadTestCommand(object):
        """A command that wasn't implement correctly."""
        pass

    except command.InvalidCommandError:
      pass
    else:
      self.fail('Invalid command was accepted by the CommandDecorator')


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