private Object retrieveInstance(ExtObjectContainer client) {
Query query = client.query();
query.constrain(_class);
query.descend("_isRoot").constrain(new Boolean(true));
return query.execute().next();
}
private void assertNoItemFoundByQuery() {
Query q = db().query();
q.constrain(Item.class);
Assert.areEqual(0, q.execute().size());
}
private void asserItemCount(final int expectedCount) {
Query query = db().query();
query.constrain(Item.class);
int itemCount = query.execute().size();
Assert.areEqual(expectedCount, itemCount);
}