创建一个
Car类，可用于实例化各种车辆。它包含描述车辆类型，型号和名称的参数，只要它们已经设置好。
让测试指导您构建汽车锅炉板。
以下是指导我的测试
class CarClassTest(TestCase):
"""docstring for CarClassTest"""
def test_car_instance(self):
honda = Car('Honda')
self.assertIsInstance(honda, Car, msg='The object should be an instance of the `Car` class')
def test_object_type(self):
honda = Car('Honda')
self.assertTrue((type(honda) is Car), msg='The object should be a type of `Car`')
def test_default_car_name(self):
gm = Car()
self.assertEqual('General', gm.name,
msg='The car should be called `General` if no name was passed as an argument')
def test_default_car_model(self):
gm = Car()
self.assertEqual('GM', gm.model, msg="The car's model should be called `GM` if no model was passed as an argument")
def test_car_properties(self):
toyota = Car('Toyota', 'Corolla')
self.assertListEqual(['Toyota', 'Corolla'],
[toyota.name, toyota.model],
msg='The car name and model should be a property of the car')
def test_car_doors(self):
opel = Car('Opel', 'Omega 3')
porshe = Car('Porshe', '911 Turbo')
self.assertListEqual([opel.num_of_doors,
porshe.num_of_doors,
Car('Koenigsegg', 'Agera R').num_of_doors],
[4, 2, 2],
msg='The car shoud have four (4) doors except its a Porshe or Koenigsegg')
def test_car_wheels(self):
man = Car('MAN', 'Truck', 'trailer')
koenigsegg = Car('Koenigsegg', 'Agera R')
self.assertEqual([8, 4], [man.num_of_wheels, koenigsegg.num_of_wheels],
msg='The car shoud have four (4) wheels except its a type of trailer')
def test_car_type(self):
koenigsegg = Car('Koenigsegg', 'Agera R')
self.assertTrue(koenigsegg.is_saloon(),
msg='The car type should be saloon if it is not a trailer')
def test_car_speed(self):
man = Car('MAN', 'Truck', 'trailer')
parked_speed = man.speed
moving_speed = man.drive(7).speed
self.assertListEqual([parked_speed, moving_speed],
[0, 77],
msg='The Trailer should have speed 0 km/h until you put `the pedal to the metal`')
def test_car_speed2(self):
man = Car('Mercedes', 'SLR500')
parked_speed = man.speed
moving_speed = man.drive(3).speed
self.assertListEqual([parked_speed, moving_speed],
[0, 1000],
msg='The Mercedes should have speed 0 km/h until you put `the pedal to the metal`')
def test_drive_car(self):
man = Car('MAN', 'Truck', 'trailer')
moving_man = man.drive(7)
moving_man_instance = isinstance(moving_man, Car)
moving_man_type = type(moving_man) is Car
self.assertListEqual([True, True, man.speed],
[moving_man_instance, moving_man_type, moving_man.speed],
msg='The car drive function should return the instance of the Car class')
这是我到目前为止的代码
class Car(object):
speed = 0
def __init__(self, name='General', model='GM', vehicle_type=None):
self.name = name
self.model = model
self.vehicle_type = vehicle_type
if self.name in ['Porshe', 'Koenigsegg']:
self.num_of_doors = 2
else:
self.num_of_doors = 4
if self.vehicle_type == 'trailer':
self.num_of_wheels = 8
else:
self.num_of_wheels = 4
def is_saloon(self):
if self.vehicle_type is not 'trailer':
self.vehicle_type == 'saloon'
return True
return False
def drive(self, moving_speed):
if moving_speed == 3:
Car.speed = 1000
elif moving_speed == 7:
Car.speed = 77
return self
最后是错误：
总规格：11总失败：1
1。 test_car_speed2第68行失败，在test_car_speed2中msg =' 梅赛德斯的速度应该是0公里/小时，直到你放
the pedal to the metal'）断言错误：梅赛德斯的速度应该是0公里/小时，直到 你把the pedal to the metal
答案 0 :(得分：3)
您需要在self.speed = 0中设置__init__()，而不是在班级设置speed = 0。这是因为你想要为每辆车创造不同的速度（目前你在全世界只有一种速度，由所有汽车共享）。