'Actions which don\'t return an HttpResponse are redirected to the same
page, retaining the querystring (which may contain changelist info).'

def test_default_redirect(self):

    action_data = {ACTION_CHECKBOX_NAME: [self.s1.pk], 'action': 'external_mail', 'index': 0}
    url = (reverse('admin:admin_views_externalsubscriber_changelist') + '?o=1')
    response = self.client.post(url, action_data)
    self.assertRedirects(response, url)
