diff --git a/beat/core/test/prefix/algorithms/user/integers_add/1.py b/beat/core/test/prefix/algorithms/user/integers_add/1.py
index 5888517b416933b9601995f52b46cd5588d598a5..601b369c8615f40389c46a4400492b82f5effef8 100644
--- a/beat/core/test/prefix/algorithms/user/integers_add/1.py
+++ b/beat/core/test/prefix/algorithms/user/integers_add/1.py
@@ -44,6 +44,10 @@ class Algorithm:
 
     def process(self, inputs, outputs):
         outputs["out_data"].write(
-            {"value": lib.sum(inputs["in_data"].data.value, self.offset)}
+            {
+                "value": lib.sum(  # noqa lib comes from library management
+                    inputs["in_data"].data.value, self.offset
+                )
+            }
         )
         return True
diff --git a/beat/core/test/prefix/libraries/user/nest1/1.py b/beat/core/test/prefix/libraries/user/nest1/1.py
index 7f4e43c3508fabd1f66b7741ef1e5d8ce5985193..44fa17bca1fbf1dfad603ac55282682e773bc9a9 100644
--- a/beat/core/test/prefix/libraries/user/nest1/1.py
+++ b/beat/core/test/prefix/libraries/user/nest1/1.py
@@ -34,6 +34,9 @@
 ###################################################################################
 
 
+# flake8: noqa valid comes from the library management
+
+
 def f(par):
     return valid.f() + par
 
diff --git a/beat/core/test/prefix/libraries/user/nest2/1.py b/beat/core/test/prefix/libraries/user/nest2/1.py
index 1330e000f65411891f0f05a9fba1aebd1a279090..b25e2c3c51ee111d43b452764a440713537c1ed6 100644
--- a/beat/core/test/prefix/libraries/user/nest2/1.py
+++ b/beat/core/test/prefix/libraries/user/nest2/1.py
@@ -34,6 +34,9 @@
 ###################################################################################
 
 
+# flake8: noqa nest1 comes from the library management
+
+
 def f(par):
     return nest1.f(par) + par