European ECE 22.05 motorcycle helmets are approved in most places in Australia - this is relatively recent - I'd have thought similar rules for pushbikes would be the case?
The helmets I have would have cost me around 1000 combined had I bought them from Europe, even with shipping/etc. The Australian Standards sticker doubled that. It's not clear to me whether that means they are tested to Australian conditions, whether our heads are different, roads and rocks are harder, etc.
I reckon there are some worthwhile 'extreme tests', burnouts on a mobile probably not one - at least it was only an iPhone