private static String generateTestKey(String deviceSerial,TestIdentifier test){
  return String.format("%s#%s",deviceSerial,test.toString());
}

private static String generateTestKey ( String deviceSerial , TestIdentifier test ) { return String . format ( "%s#%s" , deviceSerial , test . toString ( ) ) ; }
return test key in the form of device_serial # class_name # method_name
