Add unit test

kfet/tests/test_views.py

@@ -1726,6 +1726,15 @@ class KPsulPerformOperationsViewTests(ViewTestCaseMixin, TestCase):
             price=Decimal("2.5"),
             stock=20,
         )
+        # Another Article, price=2.5, stock=20, no COF reduction
+        self.article_no_reduction = Article.objects.create(
+            category=ArticleCategory.objects.create(
+                name="Category_no_reduction", has_reduction=False,
+            ),
+            name="Article_no_reduction",
+            price=Decimal("2.5"),
+            stock=20,
+        )
         # An Account, trigramme=000, balance=50
         # Do not assume user is cof, nor not cof.
         self.account = self.accounts["user"]
@@ -2079,6 +2088,35 @@ class KPsulPerformOperationsViewTests(ViewTestCaseMixin, TestCase):
         self.article.refresh_from_db()
         self.assertEqual(self.article.stock, 18)
 
+    def test_purchase_no_reduction(self):
+        kfet_config.set(kfet_reduction_cof=Decimal("20"))
+        self.account.cofprofile.is_cof = True
+        self.account.cofprofile.save()
+        data = dict(
+            self.base_post_data,
+            **{
+                "form-TOTAL_FORMS": "2",
+                "form-0-type": "purchase",
+                "form-0-amount": "",
+                "form-0-article": str(self.article_no_reduction.pk),
+                "form-0-article_nb": "1",
+                "form-1-type": "purchase",
+                "form-1-amount": "",
+                "form-1-article": str(self.article.pk),
+                "form-1-article_nb": "1",
+            }
+        )
+
+        resp = self.client.post(self.url, data)
+        self._assertResponseOk(resp)
+
+        operation_group = OperationGroup.objects.get()
+        self.assertEqual(operation_group.amount, Decimal("-4.50"))
+        operation = Operation.objects.get(article=self.article)
+        self.assertEqual(operation.amount, Decimal("-2.00"))
+        operation = Operation.objects.get(article=self.article_no_reduction)
+        self.assertEqual(operation.amount, Decimal("-2.50"))
+
     def test_invalid_purchase_expects_article(self):
         data = dict(
             self.base_post_data,