Webmozart\Console\Api\Config\ApplicationConfig::addStyle PHP Метод

    public function addStyle(Style $style)
    {
        if (!$this->styleSet) {
            $this->styleSet = new DefaultStyleSet();
        }
        $this->styleSet->add($style);
        return $this;
    }

 public function testAddStyle()
 {
     $style = Style::tag('custom');
     $this->config->addStyle($style);
     $styleSet = new DefaultStyleSet();
     $styleSet->add($style);
     $this->assertEquals($styleSet, $this->config->getStyleSet());
 }