+# ext index additions
+$over->eidx_prep;
+{
+ my @arg = qw(1349 2019 adeadba7cafe example.key);
+ ok($over->add_xref3(@arg), 'first add');
+ ok($over->add_xref3(@arg), 'add idempotent');
+ my $xref3 = $over->get_xref3(1349);
+ is_deeply($xref3, [ 'example.key:2019:adeadba7cafe' ], 'xref3 works');
+
+ @arg = qw(1349 2018 deadbeefcafe example.kee);
+ ok($over->add_xref3(@arg), 'add another xref3');
+ $xref3 = $over->get_xref3(1349);
+ is_deeply($xref3, [ 'example.key:2019:adeadba7cafe',
+ 'example.kee:2018:deadbeefcafe' ],
+ 'xref3 works forw two');
+
+ @arg = qw(1349 adeadba7cafe example.key);
+ is($over->remove_xref3(@arg), 1, 'remove first');
+ $xref3 = $over->get_xref3(1349);
+ is_deeply($xref3, [ 'example.kee:2018:deadbeefcafe' ],
+ 'confirm removal successful');
+ $over->rollback_lazy;
+}
+