test: add unit tests and fix error

.pylintrc

@@ -53,7 +53,7 @@ ignore-paths=
 # Files or directories matching the regular expression patterns are skipped.
 # The regex matches against base names, not paths. The default value ignores
 # Emacs file locks
-ignore-patterns=^\.#
+ignore-patterns=^\.#,test_.*?py
 
 # List of module names for which member attributes should not be checked
 # (useful for modules/projects where namespaces are manipulated during runtime