def test_dog_class(self):
"""Test case:
* Dog's speak method should return 'arf'.
* Dog's 'legs' method should return the output of Mammal's legs method multiplied by 2.
"""
mammal = Mammal()
dog = Dog()
self.assertEqual(dog.speak(), 'arf')
self.assertEqual(dog.legs(), mammal.legs()*2)
def test_mammal_class(self):
"""Test case:
* Mammal should have a method called 'speak' that returns 'hello'.
* Mammal should have a method called 'legs' that returns 2.
* The output of 'legs' can be overwritten by modifying the _legs attribute of the Mammal class.
"""
mammal = Mammal()
self.assertEqual(mammal.speak(), 'hello')
self.assertEqual(mammal.legs(), 2)
mammal._legs = 4
self.assertEqual(mammal.legs(), 4)
def test_init_attr_not_accesible_when_preceded_by_double_underscore(self):
"""Test case:
* test that illustrates an attribute defined in the `__init__` method of 'Mammal' is not
accessible to Dog or Cat when preceded by a double-underscore, but an attribute
preceded by a single-underscore or no underscore is.
"""
mammal = Mammal()
cat = Cat()
dog = Dog()
self.assertEqual(cat.info_type(), mammal.info_type()) # __type not accessible to Cat (is not able to overwrite it)
self.assertNotEqual(cat.info_temp(), mammal.info_temp()) # _temp accessible to Cat (is able to overwrite it)
self.assertNotEqual(cat.info_body(), mammal.info_body()) # body accessible to Cat (is able to overwrite it)
self.assertEqual(dog.info_type(), mammal.info_type()) # __type not accessible to Dog (is not able to overwrite it)
self.assertNotEqual(dog.info_temp(), mammal.info_temp()) # _temp accessible to Dog (is able to overwrite it)
self.assertNotEqual(dog.info_body(), mammal.info_body()) # body accessible to Dog (is able to overwrite it)