Bug 34435: Add unit test

Bug 34435: Add unit test

To test:
prove t/db_dependent/Koha/Patron/Category.t

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 420363258214e2c397ef604c63b13491462ed955)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit ef24af8da3bc1221cb952c27aa9fe02c86b6444c)
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>