public function testAddObserver()
 {
     $testEvent = 'testEvent';
     $observer = new \Magento\Framework\Event\Observer();
     $observer->setData('event_name', $testEvent);
     $eventName = 'eventName';
     $eventMock = $this->getMock('\\Magento\\Framework\\Event', ['getName'], [], '', false, false);
     $eventMock->setData('name', $eventName);
     $this->collection->addObserver($observer);
     $this->assertNotEmpty($this->collection->getEventByName($testEvent)->getObservers());
 }