如何检测一个期望在茉莉花/量角器中是否失败

I am trying to test a page that, as soon the page is finished loading completely, does a server-side RSA keypair generation, which takes between 5 - 20 seconds with my current set up. The user is not allowed to do anything until the browser has received the keypair.I am trying to test a page that, as soon the pa