[Tutor] Tutor Digest, Vol 157, Issue 24

[Alan Gauld]

On 10/03/17 10:50, Eloka Chima via Tutor wrote:

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> Thank you so much. Your guidance have been helpful, the bugs have been gotten rid of after I reviewed the  code. But 3 out of 6 of the test is correct, the other 3 is incorrect. Take a look at it and tell me where I went wrong.  
>>> Below is my new code:
> class ShoppingCart(object):  def __init__(self):    self.total = 0    self.items = {}  def add_item(self, item_name, quantity, price):    for item_name in self.items:      if not item_name in self.items:        self.items["item_name"] = quantity        self.total += price        return self.total    return self.items  def remove_item(self, item_name, quantity, price):    for item_name in self.items:      if item_name in self.items:        del self.items["item_name"]        self.total -= price      else:        if quantity > self.items[quantity]:          self.items = 0    return self.items  def checkout(self, cash_paid):    if cash_paid < self.total :      self.total -= cash_paid      return "Cash paid not enough"class Shop(ShoppingCart):  def __init__(self):    self.quantity = 100  def remove_item(self):    self.quantity -=1    return self.quantity
>>> This is the test for the program:
> 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)
> 
>>> I get this test result after running it:
> 1 .  test_add_itemFailure in line 20, in test_add_item self.assertEqual(self.cart.total, 30, msg='Cart total not correct after adding items') AssertionError: Cart total not correct after adding items2 .  test_checkout_returns_correct_balanceFailure in line 34, in test_checkout_returns_correct_balance self.assertEqual(self.cart.checkout(265), 75, msg='Balance of checkout not correct') AssertionError: Balance of checkout not correct3 .  test_remove_itemFailure in line 27, in test_remove_item self.assertEqual(self.cart.total, 10, msg='Cart total not correct after removing item') AssertionError: Cart total not correct after removing item.

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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