I have some projects with lots and lots of tests, with different folders and different counts. These tests take a long time to run. I sometimes disable different folders to only run a subset of tests, but it would be useful to do a dry run of a project suite so I know I am only running the tests I want to, and they'll run the correct number of times.
I suggest adding a "Dry run" option that only goes through and generates a report of tests that would be run, and the number of times they'll be run.
pytest and nosetests have a similar option called "collect-only"