100 percent test coverage achieved, patching a critical api bug in api.serializers and .views

src/apps/api/views.py

@@ -16,7 +16,7 @@ class ListDetailAPI(APIView):
 class ListItemsAPI(APIView):
     def post(self, request, list_id):
         list_ = get_object_or_404(List, id=list_id)
-        serializer = ItemSerializer(data=request.data)
+        serializer = ItemSerializer(data=request.data, context={"list": list_})
         if serializer.is_valid():
             serializer.save(list=list_)
             return Response(serializer.data, status=201)