/**
  * singleton
  *
  * @return Inventory_Controller
  */
 public static function getInstance()
 {
     if (self::$_instance === NULL) {
         self::$_instance = new Inventory_Controller();
     }
     return self::$_instance;
 }
 public function testGetModels()
 {
     $models = Inventory_Controller::getInstance()->getModels();
     $this->assertEquals(array('Inventory_Model_InventoryItem', 'Inventory_Model_Status'), $models);
 }