public function testGetDefaultFileSource()
 {
     $this->assertInstanceOf('core_kernel_versioning_Repository', $this->itemsService->getDefaultFileSource());
     $ext = \common_ext_ExtensionsManager::singleton()->getExtensionById('taoItems');
     $oldConfig = $ext->getConfig(taoItems_models_classes_ItemsService::CONFIG_DEFAULT_FILESOURCE);
     try {
         $this->assertTrue($ext->setConfig(taoItems_models_classes_ItemsService::CONFIG_DEFAULT_FILESOURCE, array()));
         $this->itemsService->getDefaultFileSource();
     } catch (\common_Exception $e) {
         $this->assertEquals('No default repository defined for Items storage.', $e->getMessage());
     }
     $this->assertTrue($ext->setConfig(taoItems_models_classes_ItemsService::CONFIG_DEFAULT_FILESOURCE, $oldConfig));
 }