Some MacBook owners around the web are reporting a 'random shutdown' issue, where the machine will - as you might guess - seemingly shutdown at random; either during work or patiently idling for your next command. If you haven't experienced this issue yourself yet but are still concerned about it, The Apple Files has devised an unofficial test to see if you might be a victim.
The test involves entering a few simple commands into the Terminal and testing a few things over roughly half an hour of your time. Just to be thorough, the author recommends running this test two or three times to be sure, but it's really up to how paranoid you're feeling. Again, this is an unofficial test, and we haven't seen any official reports or announcements from Apple on this issue, its cause or how widespread it might be, but it's simply nice to have options, hey?