Bug 30518: Unit test

Bug 30518: Unit test

This patch adds tests for checking the needs_advancing method against
a timezone and datetime that would cause an Invalid local time failure

To test:
1. Apply this patch
2. Run:
   $ kshell
   k$ prove t/db_dependent/StockRotationItems.t
=> FAIL: The feature is not implemented, tests fail to complete

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>