/**
  * @see sfProjectConfiguration
  */
 public function getPluginPaths()
 {
     if (!isset($this->cache['getPluginPaths'])) {
         $this->cache['getPluginPaths'] = parent::getPluginPaths();
     }
     return $this->cache['getPluginPaths'];
 }
 protected function getTestDirectories()
 {
     $pc = new ProjectConfiguration();
     $project_tests = sfConfig::get('sf_root_dir');
     $paths = array_merge(array($project_tests), $pc->getPluginPaths());
     $dirs = array();
     foreach ($paths as $path) {
         $dirs[] = $path;
     }
     return $dirs;
 }