Ottawa never tests the 10-2000 buttons, at least not deliberately.
Kingston CACC does, but on a rotating basis. Usually it seems they like to do them on Sunday mornings.
OPP has a different protocol. In the case of an accidental "10-78", they need to either be seen in person by a fellow officer, or they have to phone the comm center on a landline (can't even use their cell for that).