I don't think my 5 has ever tested me.
Infact, maybe it's just my 5, but in ALL the relationships I've been in.. I've noticed that the 5 is hands-down the most authentic and raw with their thoughts and feelings. (when they decide to reveal-which is a bit rare) and think they might be the most equipped of all types to defend against emotional hijacking.
In almost every relation I've ever been in there has been some kind of psychological game playing.. from very moderate to extreme.. and I've never seen the slightest, even the slightest tendency for my 5 to do this. It's probably the very best quality of our relationship, as we have been together for years now. I'm really glad to have that experience.. I think it's really healed me in alot of ways... because I haven't been able to play any kind of emotional games, be it power struggles, manipulation, guilt, I've had to take a good hard look at my own motivations, and been slapped in the face a few times when I've attempting to go to psychological war. OTOH.. IF my 5 had one weakness.. it would be sex. I've noticed it in a few 5's. If the sex is good and often enough.. you'll see a 5 become VERY sweet and tender.. but it's still on their own terms. A 5 won't tolerate emotional manipulation.. and I think because of this they also see NO NEED to manipulate another. They might watch and see, infact they prefer to do this.. they prefer to give you all the freedom in the world to be who you are.. so they know what they are getting into.