def test_valid_passport(self):
self.assertIn('ecl', self.person1)
self.assertNotIn('hgt', self.person2)
self.assertNotIn('cid', self.person3)
self.assertNotIn('cid', self.person4)
self.assertNotIn('byr', self.person4)
self.assertTrue(Day4.valid_passport(self.person1))
self.assertFalse(Day4.valid_passport(self.person2))
self.assertTrue(Day4.valid_passport(self.person3))
self.assertFalse(Day4.valid_passport(self.person4))
