I have Codeception running on my local install without errors, but it's not yet actually doing anything. I am building several plugins and I can't figure out how you actually test a plugin? I have no app code at all, all functionality comes from the plugins.
I have seen other plugins running their own custom PhpUnit code inline, but shouldn't I be able to fire off Codeception from the root app and it will test available plugins?
Fully aware that this is a vague question, but I can't find any information about specifically testing Craft plugins.