Avoid duplicate order position secrets

src/tests/base/test_models.py

@@ -577,6 +577,16 @@ class OrderTestCase(BaseQuotaTestCase):
                                      variation=None, price=23)
         assert self.order.can_user_cancel is False
 
+    def test_no_duplicate_position_secret(self):
+        item1 = Item.objects.create(event=self.event, name="Ticket", default_price=23,
+                                    admission=True, allow_cancel=False)
+        p1 = OrderPosition.objects.create(order=self.order, item=item1, secret='ABC',
+                                          variation=None, price=23)
+        p2 = OrderPosition.objects.create(order=self.order, item=item1, secret='ABC',
+                                          variation=None, price=23)
+        assert p1.secret != p2.secret
+        assert self.order.can_user_cancel is False
+
 
 class ItemCategoryTest(TestCase):
     """