'Verify that the command fails when some options are not given.'

@ddt.data('from_mode', 'to_mode', 'course')
def test_without_options(self, option):

    command_options = {'from_mode': 'audit', 'to_mode': 'honor', 'course': unicode(self.course.id)}
    command_options.pop(option)
    with self.assertRaises(CommandError):
        call_command('bulk_change_enrollment', **command_options)
