def test___str__(self, mock_get_complex_object, mock_get_age,
mock_get_species):
mock_get_complex_object.return_value = Random()
mock_get_age.return_value = 12
mock_get_species.return_value = 'Dog'
pet_instance = Pet('Clifford', 'Dog', 12)
self.assertEqual(pet_instance.__str__(),
'Random Clifford is a dog aged 12')
def test___str__(self, mock_get_species, mock_get_age):
mock_get_species.return_value = 'Dog'
mock_get_age.return_value = 12
pet_instance = Pet('Clifford', 'Dog', 12)
self.assertEquals(pet_instance.__str__(), 'Clifford is a dog aged 12')