Bug 22740: Write unit tests for automatic lost status switching

Bug 22740: Write unit tests for automatic lost status switching

This patch adds the unit tests for the new system preferences that will
automatically change an items lost status to an authorised value defined
in these preferences on payment or write off of outstanding balance.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Laura Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>