How to check if the AMP module (Accelerated Mobile Pages) is working? I'm testing the drupal AMP module (Accelerated Mobile Pages), well, I've installed it, pre-configured it (I've not created the subtheme..)but I've enabled it for one node (just for a test).

How can I test it ? Doing a google search on my browser ?

Thank you.
The first thing that needs to happen is to get it reindexed by Google so it knows about it.  I suggest configuring Google Search Console on your site https://support.google.com/webmasters/answer/4559176?hl=en  You can request it to be reindexed there. It was called Google Webmaster Tools before they rebranded it.
Its as easy to set up as Google Analytics.  It shows a display of what your site looks like on desktop, as Google sees it.  

It does show you want it looks like ton AMP.