Earlier quoted context omitted.
Not a lot has changed. You call the regional center (the 911, or in our case, 112 responders), you negotiate a timeframe for your tests (so that there's enough operators there), you tell them the phone number (and other data) that will be used for testing (because the responders get the approximate location of the caller, and might still send someone to check after a call, even if the voice doesn't get through), and…
This was also a huge issue with BlackBerry 10. We kept getting bugs about 999 being dialed because of the way the screen recognition was... The phone would wake up in your pocket, dial 999 and you'd pocket dial EMS because it was allowed to be dialed from above the lock screen no matter what.
Somehow I manage to swipe the screen up and press the relatively small 'Emergency' button, all without touching the phone. It's really weird.