in the framework there is a project called test framework, but in the advanced course, academy 2 does not teach how to use it, does anyone know if there is a tutorial or something?
You can try here:
Project Templating - the ReFramework that most of you are already familiar with was promoted to Studio template. The documentation for the ReFramework is at its usual place on GitHub: https://github.com/UiPath/ReFrameWork/tree/master/Documentation
The document doesnot contain the details of the test framework.
this document dont explain how to use the TEST framework for unit test
You dont need to use it. Like I see, its kinda confusing but you can definately create your own workflow. that is also fine.
As long as you are able to run it correctly.