Bug 15030: Add tests

Bug 15030: Add tests

This test will prevent regression on the lost of data when
items.itemcallnumber is linked with a plugin.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit eee1f23bc49d233bca6c8a8004dd6e79e2425484)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
(cherry picked from commit 6f959cd149c0484417056f50b0fb6590c837c428)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>