public function test_querying()
{
$model = new Example();
$backend = new MockBackend();
$model->set_backend($backend);
$model->filter("username", "test");
$model->filter("username", "again", "!=");
$model->order("testorder");
$model->limit(5);
$model->offset(2);
$this->assertEquals(2, count($backend->query["filter"]));
$this->assertEquals("testorder", $backend->query["order"]);
$this->assertEquals(5, $backend->query["limit"]);
$this->assertEquals(2, $backend->query["offset"]);
}