Again, the tests need to run on a production system.
memtest86 only works with liveCD or USB stick, with easy run an error segmentation.
cpuburn does not spit out any results of testing in the console and just load percent.
here is what I managed to dig up
stress --cpu 8 --io 4 --vm 2 --vm-bytes 1024M --timeout 20s |grep successful
smartctrl -H|grep PASSED