Cool there is another set of Whelens in London, Ontario at Western University that did sound for a tornado warning in 2013 and they supposedly test it every Wednesday at noon but I emailed them and they do a quiet test every Wednesday instead of an audible test. They do audible tests on the first Wednesday of the month at noon for some reason...
Here is the tornado warning video of the one whelen sounding. at the time we only had one whelen I think and the other one has yet to be installed at the time.
https://www.youtube.com/watch?v=L-go6Q31FZY - skip to around 1:13 to hear the University's sirens go off.