Every type has their tests. INFJ's especially have their tests. I have my tests. It just depends who is doing the testing and who is recieving. For example I'll tell a joke about pure capitalistic opportunism to test if they're some Fi reactive who's going to disapprove of my entrepreneurial spirit. Or I'll tell a girl she's "as attractive as a piece of shit", to see if she's the type to explode if I make one offhanded remark (which is often).
Anyway I don't want to deviate too far, but, aside from all the testing etc, I'm still wondering if Fi users appologize through actions and not through words. The only time I've heard an Fi user apologize in my life was when I yelled at my ESTJ father for not listening to me.
Through experience I've come to expect Fi users to apologize through their actions, and I wonder, from an Fi perspective, if this is true or if these people are just being douche tits and I've had a stroke of bad luck in making friends.