I cannot respect a TDD guide that is dependent on your editor. Doing tdd is about code structure and implementations decisions imho. If you need to check some box in a dialog window of a certain editor in order to run your tests, your test runner isn't good enough.
It's not dependent upon my editor. Maybe I should move this up higher in the readme: https://github.com/zpratt/react-tdd-guide#running-the-tests-... . All I was adding for Webstorm was a note for the convenience of people who choose to use it, which I might be able to move into a mocha.opts.