def _test_link_field(self, field_id, title, link_title, success_message):
        """
        Test behaviour a link field.
        """
        self.assertEqual(self.account_settings_page.title_for_field(field_id), title)
        self.assertEqual(self.account_settings_page.link_title_for_link_field(field_id), link_title)
        self.account_settings_page.click_on_link_in_link_field(field_id)
        self.account_settings_page.wait_for_message(field_id, success_message)