Hudad

Good day all! I have a 2010 Jeep Wrangler with the 2,8L diesel engine that has recently started running rough at idle. It has also lost some power,so I took it to a mechanic who said that it sounds like the compression is low on one cylinder. I can accept that, but how does one do a compression test on a diesel engine? Can I do it myself? Is it much different from a compression test on a petrol engine? Has anyone here ever done this test on any diesel engine? Any advice would be appreciated.