Bug 26636: Regression tests for undef case

This patch adds tests for the case in which there's no object identified
by the supplied $id. It should return undef.

Sponsored-by: Virginia Polytechnic Institute and State University

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

t/db_dependent/Koha/REST/Plugin/Objects.t

@@ -470,7 +470,7 @@ subtest 'object.search helper order by embedded columns' => sub {
 
 subtest 'objects.find helper' => sub {
 
-    plan tests => 6;
+    plan tests => 9;
 
     my $t = Test::Mojo->new;
 
@@ -487,6 +487,13 @@ subtest 'objects.find helper' => sub {
       ->status_is(200)
       ->json_is( $city_2->to_api );
 
+    # Remove the city
+    my $city_2_id = $city_2->id;
+    $city_2->delete;
+    $t->get_ok( '/cities/' . $city_2_id )
+      ->status_is(200)
+      ->json_is( undef );
+
     $schema->storage->txn_rollback;
 };