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我正在 OOP 中进行测试，我希望在其中创建一个 ShoppingCart。

我已经编写了通过 unittest 的所有测试的代码，但是当我尝试提交时，我收到了这个错误/错误

/bin/sh: 1: python/nose2/bin/nose2: 未找到

下面我展示了我的代码和单元测试。最统一的

import unittest


class ShoppingCartTestCases(unittest.TestCase):

def setUp(self):
    self.cart = ShoppingCart()
    self.shop = Shop()

def test_cart_property_initialization(self):
    self.assertEqual(self.cart.total, 0, msg='Initial value of total not correct')
    self.assertIsInstance(self.cart.items, dict, msg='Items is not a dictionary')

def test_add_item(self):
    self.cart.add_item('Mango', 3, 10)

    self.assertEqual(self.cart.total, 30, msg='Cart total not correct after adding items')
    self.assertEqual(self.cart.items['Mango'], 3, msg='Quantity of items not correct after adding item')

def test_remove_item(self):
    self.cart.add_item('Mango', 3, 10)
    self.cart.remove_item('Mango', 2, 10)

    self.assertEqual(self.cart.total, 10, msg='Cart total not correct after removing item')
    self.assertEqual(self.cart.items['Mango'], 1, msg='Quantity of items not correct after removing item')

def test_checkout_returns_correct_balance(self):
    self.cart.add_item('Mango', 3, 10)
    self.cart.add_item('Orange', 16, 10)

    self.assertEqual(self.cart.checkout(265), 75, msg='Balance of checkout not correct')
    self.assertEqual(self.cart.checkout(25), 'Cash paid not enough', msg='Balance of checkout not correct')

def test_shop_is_instance_of_shopping_cart(self):
    self.assertTrue(isinstance(self.shop, ShoppingCart), msg='Shop is not a subclass of ShoppingCart')

def test_shop_remove_item_method(self):
    for i in range(15):
        self.shop.remove_item()

    self.assertEqual(self.shop.quantity, 85)

我的代码

class ShoppingCart(object):

    def __init__(self):
        self.total = 0
        self.items = {}

    def add_item(self, item_name, quantity, price):
        if item_name and quantity >= 1:
            self.items.update({item_name : quantity})
        if quantity and price >= 1:
            self.total += (quantity * price)

    def remove_item(self, item_name, quantity, price):
        self.total -= (quantity * price)
        if quantity >= self.items[item_name]:
            try:
                del self.items[item_name]
            except (KeyError, ValueError):
                return None
        self.items[item_name] -= quantity

    def checkout(self, cash_paid):
        balance = 0
        if cash_paid < self.total:
            return "Cash paid not enough"
        balance = cash_paid - self.total
        return balance

class Shop(ShoppingCart):

    def __init__(self):
        ShoppingCart.__init__(self)
        self.quantity = 100

    def remove_item(self):
        self.quantity -= 1
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1 回答 1

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问题的根本原因在于 unittest 类中的 setUp() 方法。因此，在 IDLE 等 Python 开发环境中运行 unittest 类会进一步暴露问题。完整的错误实际上是这样的

“ Desktop/practice python/shoppingcarttestcases.py”，第 4 行，在 setUp self.cart = ShoppingCart() NameError: global name 'ShoppingCart' is not defined"

解决方案可能在于正确定义/继承/实现类购物车。

我希望这能缩小范围。如果您觉得这对您有帮助并且您得到了解决方案，也请在论坛上发帖。

于 2017-03-18T18:59:51.297 回答