public function testHandleWithUnsupportedEventThrowsException()
 {
     self::setExpectedException(\InvalidArgumentException::class);
     $event = $this->getMockBuilder(Event::class)->getMock();
     $storage = $this->getMockBuilder(Storage::class)->disableOriginalConstructor()->getMock();
     $service = new UserService($storage);
     $service->on($event);
 }