--- a/tests/tools/check_source.sh	Wed Oct 11 13:15:21 2017 +0300
+++ b/tests/tools/check_source.sh	Wed Oct 11 13:55:56 2017 +0300
@@ -254,6 +254,7 @@
     enable=$enable,E0701          # (bad-except-order) Bad except clauses order (X is an ancestor class of Y)
     enable=$enable,E0611          # (no-name-in-module) No name 'X' in module 'Y'
     enable=$enable,E0213          # (no-self-argument) Method should have "self" as first argument
+    enable=$enable,E0401          # (import-error) Unable to import 'X'
     # enable=
 
     options=