The big 6 banks already stress test at the posted rate for ALL mortgages.  It's the alternative lenders, and broker channels that fraud the system as they never retain the loans they under-write. They buy portfolio insurance on the mortgages and sell then in the market. Yes mortgage back securities, the same that crashed America's market.  
In Toronto its CRAZY. RBC approved us for 900K mortgage and then I went to a broker that approved me for 1.4M! 
When they did the stress on insured mortgages last year everyone bundles their mortgages with B lenders and side stepped the rule. 
This was fraud! OSFI should be pissed! They are going to slap this industry so hard.