private function getSubPageCountFor($pageName)
 {
     $extension = new Extension(Settings::newFromGlobals($GLOBALS));
     $functionRunner = new FunctionRunner($extension->getCountHookDefinition(), $extension->getCountHookHandler());
     $frame = $this->getMock('PPFrame');
     $frame->expects($this->once())->method('expand')->will($this->returnArgument(0));
     $result = $functionRunner->run($GLOBALS['wgParser'], array('page' => $pageName), $frame);
     return reset($result);
 }