Bug 21560: Unit test for Koha::Util::OpenDocument

Bug 21560: Unit test for Koha::Util::OpenDocument

Run prove t/Koha/Util/OpenDocument.t

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 99ea714345a6278d68e2abb0d182d8b495cf2950)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 31ebb5abd003f41576febe7a53c27046236e9653)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 13cdadbe8f13f81e4774403b09c4abd1d27a6c6a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>