/**
  * @param LoadCssEvent $event
  */
 public function onLoadCss(LoadCssEvent $event)
 {
     $activeTheme = $this->themeRegistry->getActiveTheme();
     if ($activeTheme) {
         $event->addCss('theme', $activeTheme->getStyles());
     }
 }
 public function testAddCss()
 {
     $group = 'test';
     $files = array('styles.css');
     $this->assetsConfiguration->expects($this->once())->method('addCss')->with($group, $files);
     $this->event->addCss($group, $files);
 }