And to be fair there are many places including like half of US states where a paternal test if not court ordered requires the consent of both parents listed on the birth certificate.

And to get a court mandate in such cases where you think the child might not be yours you must basically "prove" the mother had to opportunity to cheat on you and that it could have resulted in the conception, and even then it may not exempt you from paying child support if you are listed as the father on the birth certificate you may only be able to claim them back from the biological father if you ever find him.