Bug 27808: Add unit tests

Bug 27808: Add unit tests

Signed-off-by: Lisette Scheer <lisettes@latahlibrary.org>
Signed-off-by: Marti Fuerst <mfuerst@hmcpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 36c49aa2a865a069592c5d7695127252a3007f44)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 1f8bc45f2d367ed5c7e97c047ddbbb8dafa8ebf5)

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