Bug 23207: Regression tests

Bug 23207: Regression tests

This patch introduces a regression test for the case the automatic
checkin happens after the date due. In that case the item souldn't
really be overdue, and the checkin should be recorded with the date due
as return date.

To test:
1. Apply this patch
2. Run:
   $ kshell
  k$ prove t/db_dependent/Koha/Checkouts.t
=> FAIL: The feature doesn't behave correctly

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>