All replies on this forum must be interpreted in context. The take-home message from the thread you refer to is not that fingering is a risk or that any cut on the fingers increases the risk. That thread concerned exposure to a sex worker in Tanzania, where HIV rates are extremely high, especially in sex workers, whereas the rates are very low in virtually all dominantly Islamic countries, probably including Moroccan sex workers. That thread also speculated about an unusually deep and fresh cut. And as you describe yourself, you didn't even penetrate her vagina with the cut finger.
So relax. The replies to your questions are 1) there was no risk, 2) you do not need testing, and 3) I never guarantee someone isn't infected, but if these events are the only ones during which you could have acquired STDs or HIV, then your partner is not at risk.
Best wishes-- HHH, MD