def test_merge(self):
jws1 = Jws.from_json('{ "alg": "RS256"}')
jws2 = Jws.from_json('{ "kid": "2019"}')
self.assertIsNotNone(jws1)
self.assertIsNotNone(jws2)
self.assertEqual(jws1.alg, SigEnum.RS256)
self.assertEqual(jws2.kid, "2019")
jws3 = Jws.merge(jws1, jws2)
self.assertEqual(jws3.alg, SigEnum.RS256)
self.assertEqual(jws3.kid, '2019')
