addition of tests for PID 26231, PID 584, PID none, namespace none.
addition of tests for PID 26231, PID 584, PID none, namespace none.

prometheus/client_python,alexander-95/client_python,thomaso-mirodin/client_python,justyns/client_python,machinelady/client_python,arturhoo/client_python,korfuri/client_python