public function testRawHaving()
{
$query = new Query(array('type' => 'read', 'model' => $this->_model, 'having' => null));
$this->assertEmpty($this->_db->having(5, $query));
$this->assertEmpty($this->_db->having(null, $query));
$this->assertEqual("HAVING CUSTOM", $this->_db->having("CUSTOM", $query));
}