No it's not pointless to get tested. You should both do so now--since you have been somewhat intimate, you have been exposed to what ever germs she has, so you both need to be tested.
Also, vasectomies occasionally do fail, or heal up, so women do sometimes get pregnant by a partner who has had a vasectomy. There have even been cases where the woman was also using birth control, but even with both partners "fixed" they still got pregnant. So, you do still need to use protection.
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau