public function match(RequestInterface $request)
{
    $rewrite = $this->getRewrite(
        $request->getPathInfo(),
        $this->storeManager->getStore()->getId()
    );

    $identifier = trim($request->getPathInfo(), '/');

    if($identifier==='testing'){
        $rewrite = new UrlRewrite();
        $rewrite->setTargetPath("catalog/category/view/id/18");
        $rewrite->setRequestPath("testing");
        $rewrite->setRedirectType(0);
        $rewrite->setEntityType("category");

        //return $this->processRedirect($request, $rewrite);
    }

    if ($rewrite === null) {
        //No rewrite rule matching current URl found, continuing with
        //processing of this URL.
        return null;
    }
    if ($rewrite->getRedirectType()) {
        //Rule requires the request to be redirected to another URL
        //and cannot be processed further.
        return $this->processRedirect($request, $rewrite);
    }
    //Rule provides actual URL that can be processed by a controller.
    $request->setAlias(
        UrlInterface::REWRITE_REQUEST_PATH_ALIAS,
        $rewrite->getRequestPath()
    );
    $request->setPathInfo('/' . $rewrite->getTargetPath());
    return $this->actionFactory->create(
        MagentoFrameworkAppActionForward::class
    );
}