Bug 28503: Unit tests

Bug 28503: Unit tests

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit a4cdeaae3f82ea47fe3fba5e79f419e6911fb524)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 77515dbb4db68dd40b058834b2293ad704b5e2bc)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>