Bug 28604: Regression tests

Bug 28604: Regression tests

This patch introduces regression tests for the encoding issue with MiJ
output.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit fc1e15029f617ac18cba8508b99159358c132724)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>