Hello,

Attached is a patch for the emacs-25 branch
test/automated/abbrev-tests.el. It comprises a couple of tests copied
from the master branch, minor modifications and a bunch of new tests.

In the abbrev-table-p-test, I've commented out a check that works in
master but not in emacs-25 (and vice-versa) - pointers on how to fix
this would be greatly appreciated. Any other hints and advice also
welcome :-)

Thanks,

Lee.