DotsUnited\BundleFu\Filter\FilterChain::appendFilter PHP Метод

    public function appendFilter(FilterInterface $filter)
    {
        return $this->addFilter($filter, self::CHAIN_APPEND);
    }

 public function testGetFilters()
 {
     $filter = new FilterChain();
     $filter1 = new StripUpperCase();
     $filter2 = new LowerCase();
     $filter->appendFilter($filter1)->prependFilter($filter2);
     $array = $filter->getFilters();
     $this->assertEquals($filter2, $array[0]);
     $this->assertEquals($filter1, $array[1]);
 }