def test_validate(self, digest, decode, base64, time):
time.return_value = 10
decode.return_value = Policy('', 20)
key = Mock()
encoded = '12345=='
signature = '0x44'
# test
policy = Policy.validate(key, encoded, signature)
# validation
digest.assert_called_once_with(encoded)
base64.decode.assert_called_once_with(signature)
key.verify.assert_called_once_with(digest.return_value, base64.decode.return_value)
decode.assert_called_once_with(encoded)
self.assertEqual(policy, decode.return_value)
