[racket] Running subset of RackUnit tests

Hi,

I have a I'm trying to figure out how to run specific test subsets. I
have organized different subsets into test suites, and do run-tests on
each of them, but I would prefer a scheme where:

1) I can run all of the tests for a project, and
2) I can "tag" tests to run subsets.

Is there a way to accomplish this?

Thanks in advance