'The mail should be sent to the email addresses specified in
settings.MANAGERS.'

def test_manager_receivers(self):

    call_command('sendtestemail', '--managers')
    self.assertEqual(len(mail.outbox), 1)
    mail_message = mail.outbox[0]
    self.assertEqual(sorted(mail_message.recipients()), ['admin_and_manager@example.com', 'manager@example.com'])
