/**
  * The test will add manually classes to the index.
  *
  * The test will assert with this method, that a class in the index is not
  * searched by the file system.
  *
  * @param String $class The class name
  * 
  * @return void
  */
 public function addClassToIndex($class)
 {
     $this->normalizeClass($class);
     if ($this->index->hasPath($class)) {
         return;
     }
     $this->index->setPath($class, parent::searchPath($class));
 }