Bug 32804: Add unit tests

Bug 32804: Add unit tests

JD amended patch
-    is( $item1->homebranch, $library->branchcode, "Item was overlayed succesfully" );
+    is( $item1->homebranch, $library->branchcode, "Item was overlaid successfully" );

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 8f5d3612ee74e48293667af90a03f714d87e062a)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>