Sulu\Bundle\AdminBundle\Navigation\NavigationItem::setHeaderIcon PHP Method

    public function setHeaderIcon($headerIcon)
    {
        $this->headerIcon = $headerIcon;
    }

 public function testHeader()
 {
     $this->navigationItem->setHeaderIcon('icon');
     $this->navigationItem->setHeaderTitle('title');
     $this->assertEquals('icon', $this->navigationItem->getHeaderIcon());
     $this->assertEquals('title', $this->navigationItem->getHeaderTitle());
 }