Exercise\HTMLPurifierBundle\CacheWarmer\SerializerCacheWarmer::isOptional PHP Метод

    public function isOptional()
    {
        return false;
    }

 public function testShouldBeRequired()
 {
     $cacheWarmer = new SerializerCacheWarmer(array(), new \HTMLPurifier());
     $this->assertFalse($cacheWarmer->isOptional());
 }