def METHOD_NAME(self):
    """We shall display the form only for staff, not for authors."""
    fragment = _("Modifier les labels")
    self.client.force_login(self.author)
    response = self.client.get(self.content_url)
    self.assertNotContains(response, fragment)
    self.client.force_login(self.staff)
    response = self.client.get(self.content_url)
    self.assertContains(response, fragment)