text: from decimal import Decimal as D
  
  from django.test import TestCase
  import mock
  
  from oscar.apps.offer import models
  from oscar.test import factories
  from oscar.test.basket import add_product, add_products
  
  
  class TestAFixedPriceDiscountAppliedWithCountCondition(TestCase):
  
      def setUp(self):
          range = models.Range.objects.create(
              name="All products", includes_all_products=True)
          self.condition = models.CountCondition.objects.create(
              range=range,
              type=models.Condition.COUNT,
              value=3)
          self.benefit = models.FixedPriceBenefit.objects.create(
              range=range,
              type=models.Benefit.FIXED_PRICE,
              value=D('20.00'))
          self.offer = mock.Mock()
          self.offer.applies_to_tax_exclusive_prices = False
          self.basket = factories.create_basket(empty=True)
  
      def test_applies_correctly_to_empty_basket(self):
          result = self.benefit.apply(self.basket, self.condition, self.offer)
          self.assertEqual(D('0.00'), result.discount)
          self.assertEqual(0, self.basket.num_items_with_discount)
          self.assertEqual(0, self.basket.num_items_without_discount)
  
      def test_applies_correctly_to_basket_which_is_worth_less_than_value(self):
          add_product(self.basket, D('6.00'), 3)
          result = self.benefit.apply(self.basket, self.condition, self.offer)
          self.assertEqual(D('0.00'), result.discount)
          self.assertEqual(0, self.basket.num_items_with_discount)
          self.assertEqual(3, self.basket.num_items_without_discount)
  
      def test_applies_correctly_to_basket_which_is_worth_the_same_as_value(self):
          add_product(self.basket, D('5.00'), 4)
          result = self.benefit.apply(self.basket, self.condition, self.offer)
          self.assertEqual(D('0.00'), result.discount)
          self.assertEqual(0, self.basket.num_items_with_discount)
          self.assertEqual(4, self.basket.num_items_without_discount)
  
      def test_applies_correctly_to_basket_which_is_more_than_value(self):
          add_product(self.basket, D('8.00'), 4)
          result = self.benefit.apply(self.basket, self.condition, self.offer)
          self.assertEqual(D('4.00'), result.discount)
          self.assertEqual(3, self.basket.num_items_with_discount)
          self.assertEqual(1, self.basket.num_items_without_discount)
  
      def test_rounding_error_for_multiple_products(self):
          add_products(self.basket,
                       [(D('7.00'), 1), (D('7.00'), 1), (D('7.00'), 1)])
          result = self.benefit.apply(self.basket, self.condition, self.offer)
          self.assertEqual(D('1.00'), result.discount)
          # Make sure discount together is the same as final discount
          # Rounding error would return 0.99 instead 1.00
          cumulative_discount = sum(
              line.discount_value for line in self.basket.all_lines())
          self.assertEqual(result.discount, cumulative_discount)
          self.assertEqual(3, self.basket.num_items_with_discount)
          self.assertEqual(0, self.basket.num_items_without_discount)
  