As mike-no says, saliva inactivates the virus. This is why no one gets HIV from oral sex. The only way adults get it is from unprotected vaginal or anal sex or sharing of IV drug needles. This wasn't a risk.
No risk whatsoever. Recieving oral sex is not a risk, even if your friend is HIV positive and his semen was inside this lady's mouth while performing oral sex on to you, there is no risk that can be associated to this event as saliva inhibits the virus.
Testing is not recommended.