How to stress test any android phone?

[bone2006]

I'm about to buy a used mytouch phone for a family member and was wondering is there any advice to make sure there isn't any issues with the phone? I was planning on taking the battery out and looking for any water damage, putting in my sim card and downloading and running quadrant, which is a benchmarking tool.
Are there anything out there that can quickly stress test the phone to see if there's any issues?

Any suggestions to make sure there's no issues with the phone will be greatly appreciated