'Should omit changing root directory if no `chroot_directory`.'

def test_omits_chroot_if_no_chroot_directory(self):

    instance = self.test_instance
    instance.chroot_directory = None
    unwanted_output = '                                                ...Called    daemon.daemon.change_root_directory(...)...'
    instance.open()
    self.failIfMockCheckerMatch(unwanted_output)
