Remove test dependencies from package R

Question

I am developing an R package that has a brilliant application. I am trying to add testing for a brilliant component, which means that I now have the dependencies necessary for this testing.

However, they make life potentially difficult for users, given their own dependencies and for future CRAN filing, as they are only available on github.

Is there a method for including test dependencies (and tests) in non-main branches? I can remove these tests and dependencies manually on the main branch as a possible solution, but it does not seem ideal.