public function testExtra() {
		$object = new MockPostObject(array('id' => 1, 'data' => 'test'));
		$query = new Query(array(
			'conditions' => 'foo', 'extra' => 'value', 'extraObject' => $object
		));
		$this->assertEqual(array('foo'), $query->conditions());
		$this->assertEqual('value', $query->extra());
		$this->assertEqual($object, $query->extraObject());
		$this->assertNull($query->extra2());
	}