Bug 25855: Unit tests

Bug 25855: Unit tests

This patch adds tests fr a new circulation hook for plugins.
In this case the post_renewal_action hook,

The tests add the hook to the Test plugin, and verify that all the
required parameters are passed for the plugin hook to use them.
It relies on throwing an exception that is to be caught.

Sponsored-by: ByWater Solutions
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>