Bug 21301: add unit tests

Bug 21301: add unit tests

Run t/db_dependent/ILSDI_Services.t with and without previous patches

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit d828feafbd5f3b788d76a1a79bc4c0522bdb600e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit f345f480c2b6fdaeb000d0e68bd7bf1c367e41f1)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>