Bug 29105: Unit test

Bug 29105: Unit test

This patch adds a unit test for the addition of effective_item_type_id
to the items responses.

Test plan
1) Run the unit test prior to applying the second patch and confirm it
   fails
2) Apply the second patch and confirm the unit test now passes

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 6ca908816f2e56acced272f7fc56a0f68df62a43)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 5974ff87c72aa4ae94578a930a2570c02225623b)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>