Welcome!
I read that book pretty recently actually – unfortunately I have not ever messed with the JME3 Tests. I found this thread JME3 Tests project is missing code
I’m wondering if that is maybe still an issue? I’m at work so I can’t mess with it myself right now unfortunately … maybe someone else can chime in or perhaps you can take a screenshot of what your packages and source folder look like in the SKD? I’m wondering if maybe they’re still missing.
So far myself I have just copy pasted code from the wiki examples and whatnot. That TestWalkingChar file I actually am familiar with as I was just messing with it the other day and it has a couple of issues with the animation layers and the BombControl import.
In the meantime I would keep reading and skip over that part or else maybe mess a bit with the wiki demo codes which most of them work off the wiki page but some have updated code that is just not on the wiki yet All updated wiki code
Maybe someone else can chime on on the state of the JME3 Tests