code: public function fileHas($contains)
      {
          $this->files = (new ClassIterator($this->finder->contains($contains)))->getClassMap();
  
          $this->count = count($this->files);
  
          return $this;
      }
docs: Get classes from given files.
  
  @param  $contains
  
  @return \Qafeen\Manager\Manage\File