Where and how do I import the GTFS file to start the tests?

I’m still having trouble starting the public transport module tests. Can you help me with the following issues?

How do I import GTFS files and start public transport routing tests?

I ask your help because we can not find any answers to these questions at https://discuss.graphhopper.com/c/graphhopper/public-transit.

Thank you!!

Have a look into our documentation https://github.com/graphhopper/graphhopper/#for-public-transit
If there is a problem, please include configuration and logs etc