def test_invalid(self): """test getter/setter for the invalid attribute""" node = Tag(wraptext("br"), self_closing=True, implicit=True) self.assertFalse(node.invalid) node.invalid = True self.assertTrue(node.invalid) self.assertEqual("</br>", node) node.invalid = 0 self.assertFalse(node.invalid) self.assertEqual("<br>", node)