public void conc(ExtObjectContainer oc) {
oc.queryByExample((new QueryNonExistantTestCase(true)));
assertOccurrences(oc, QueryNonExistantTestCase.class, 0);
Query q = oc.query();
q.constrain(new QueryNonExistantTestCase(true));
Assert.areEqual(0, q.execute().size());
}
