We want to perform patching in our splunk Environment, but we are not aware of complete patch testing process.
What is the complete procedure to perform patching in splunk 6.5.x?
what are the prerequisite to perform patching?
I'm not sure what you mean by patching. You mean upgrading Splunk to a newer version?
Splunk versions come in entirety not in small patches
Update complexity varies depending if your system is standalone or clustered
please follow http://docs.splunk.com/Documentation/Splunk/6.5.3/Installation/HowtoupgradeSplunk