It is not part of the test program,  it is their Fishing Library program, which is entirely volunteer.  I for one like it.  Got my first book a few days ago.  I received Trilene line and two bobbers.  I will use the bobbers on my Propeil Pocket Fisherman that I picked up to fish alongside the roads down here when I don't have my pole and reel.

   They should have given you a return postage paid sticker to return it.  All you have to do is call them, on their 800 number, or include a note and they will stop the fishing library program for you.  Personally I am requesting them to send me a list of books in the library, since I might buy a few more.  I think for what you get free,  they are a bargain. ($10.54)  But there will be some books I have no use for.  The Bass Strategies book is very good, and if I'm not actually fishing I enjoy reading about it.

    I've known the NAFC for over twenty years, but just joined so I am newer then you.  But it is worth it,  you meet terrific people.  And most want to help you.  I would vote for you to try the library for a month or two,  request a list of what's in it.........and then decide.  Happy fishing!