Where is the nice manual about frappe unit testing framework?

Hi guys,

We used to refer to https://frappe.io/developers/api/writing-tests for a nice guide on how to compose unit/functional tests for Frappe applications. Unfortunately this URL started to respond with “Page Not Found” prompt (we noticed it today, actually).

Could you please provide us with the right reference to the new URL of such a manual?

We also noticed the guide per https://frappe.github.io/frappe/user/en/guides/basics/writing-tests.html. Is it supposed to supersede what we previously used to work with at https://frappe.io/developers/api/writing-tests ?

Thank you for your clarifications.