It was written by Crystal Liu, directed by Anthony Hemingway and focuses on the camp girls planning revenge on Dell (Michael Chiklis).
After caring for Paul, Penny returns home to tell her father that she is moving out, but he knocks her out and has his "artist friend" tattoo her face and head and give her a forked tongue.
The critical consensus reads: "While the season's suspense is building nicely, "Test of Strength" is basically a filler episode that does nothing more than tease future tragedy."
Not to mention the rendition of a Nirvana song that would be written roughly forty years after the episode takes place.
"[1] Matt Fowler of IGN wrote: "Test of Strength" may have mostly been power plays and backstabbing, but it was tight, focused and really helped Dell feel like a more present character... Of course, part of me is crediting this episode for feeling "tight" just because it came in at a normal episode length and not one of FX's new-fangled hour and twenty minute dawdle-fests.