public function testClosuresCanBeInvoked()
 {
     $command = new CompleteTaskCommand();
     $closureWasExecuted = false;
     $handler = function () use(&$closureWasExecuted) {
         $closureWasExecuted = true;
     };
     $this->methodNameInflector->shouldReceive('inflect')->andReturn('__invoke');
     $this->handlerLocator->shouldReceive('getHandlerForCommand')->andReturn($handler);
     $this->commandNameExtractor->shouldReceive('extract')->with($command);
     $this->middleware->execute($command, $this->mockNext());
     $this->assertTrue($closureWasExecuted);
 }