feat: lots of changes

shop/tests/test_shop_models.py

@@ -29,9 +29,15 @@ class ShopModelsTest(TestCase):
             unit=Product.UnitChoices.UNIT,
         )
 
-        ProductPrice.objects.create(product=self.potatoes, price=Decimal("0.80"))
-        ProductPrice.objects.create(product=self.gasoline, price=Decimal("1.15"))
-        ProductPrice.objects.create(product=self.usb_c, price=Decimal("9.95"))
+        ProductPrice.objects.create(
+            product=self.potatoes, price=Decimal("0.80"), tax=self.tax
+        )
+        ProductPrice.objects.create(
+            product=self.gasoline, price=Decimal("1.15"), tax=self.tax
+        )
+        ProductPrice.objects.create(
+            product=self.usb_c, price=Decimal("9.95"), tax=self.tax
+        )
 
     def test_create_order(self):
         self.customer = Customer.objects.create(
@@ -57,19 +63,16 @@ class ShopModelsTest(TestCase):
         l1 = create_order_line_for_product(
             self.potatoes,
             quantity=Decimal("1.5"),
-            tax=self.tax,
             order=order,
         )
         l2 = create_order_line_for_product(
             self.gasoline,
             quantity=Decimal("40"),
-            tax=self.tax,
             order=order,
         )
         l3 = create_order_line_for_product(
             self.usb_c,
             quantity=Decimal("1.00"),
-            tax=self.tax,
             order=order,
         )
         order.calculate_total_from_lines()