How to test a popup with a functional test?

Question

symfony

How to test using symfony dom crawler
1 - is there a link to which to click to pop up a popup +
2 - click -
3 - check if the popup pops up -
5 - check if there is a form in it +
6 - check for the presence of fields +
7 - check the presence of a button +
8 - check its translation +
9 - send the form + 10 - check the redirect
, confirm that it happened -
11 - check the response 200 from the redirect etc. it's just in the document, but how to check whether the form has popped up?

Answer 1

and what, did the symphony crawler learn how to execute js or render css?
Silenium or headless browsers like Phantom were used all the way for these things.