protected function setUp()
 {
     parent::setUp();
     $this->application = static::getMock(Application::class);
     $this->sut = $this->getSut();
     $command = static::getMockBuilder(Command::class)->disableOriginalConstructor()->getMock();
     $command->expects(static::any())->method('getApplication')->willReturn($this->application);
     $command->expects(static::any())->method('getName')->willReturn('mock command');
     $helperSet = new HelperSet();
     $helperSet->setCommand($command);
     $this->sut->setHelperSet($helperSet);
     $this->application->setHelperSet($helperSet);
 }