import unittest;

class Test(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_add_item_hidden(self):
        self.cart.add_item('Mango', 3, 10)
        self.cart.add_item('Orange', 16, 10)
        self.assertEqual(self.cart.total, 190, msg='Cart total not correct after adding items')
        self.assertEqual(self.cart.items['Orange'], 16, 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')


class ShoppingCart(object)


class Shop(ShoppingCart