public function testAddUpdate()
 {
     $processor = $this->getMock('Magento\\Framework\\View\\Layout\\ProcessorInterface', [], [], '', false);
     $processor->expects($this->once())->method('addUpdate')->with('handle_name');
     $this->layout->expects($this->once())->method('getUpdate')->will($this->returnValue($processor));
     $this->resultLayout->addUpdate('handle_name');
 }
 /**
  * {@inheritdoc}
  */
 public function addUpdate($update)
 {
     $pluginInfo = $this->pluginList->getNext($this->subjectType, 'addUpdate');
     if (!$pluginInfo) {
         return parent::addUpdate($update);
     } else {
         return $this->___callPlugins('addUpdate', func_get_args(), $pluginInfo);
     }
 }