Even PA4 Conspires Against Me!

As you could see from my last few posts, PA4 was going along great.  I made progress steadily until the very, very end.  The getInv() method's unit test fails, and I have absolutely no idea why.  I've fought with it off and on for the last nine hours, and I've made no progress.  For now, I give up.  I'll work on other stuff and come back to this later if there's time.

I'm leaving PA4 right here:

Curse you, getInv!