How to test private services in Symfony 5?

Question

symfony

The documentation says that the services in testing are available. But they immediately refer to the fact that during "copying" unused ones are "deleted". And so it turns out that all the services are not available in my tests... I

redefine them as public in the "test" project for the tested bundle. But in another project, these tests will no longer run, since by default all services are private.

What to do then?