I have an addon whose primary purpose is proving test helpers for use in other addons: ember-test-utils. After a suggestion from @rwjblue we put that code in addon-test-support/. I've now configured ember-cli-code-coverage to see if I can make sure we're exercising all the test helpers in that addon, and I can't seem to get the code from addon-test-support/ to show up in the coverage report. At first, I thought maybe it was being trimmed here, but I put a console.log() there and I don't see my files being dropped by that function.

I'll continue to investigate, and submit a PR if I find the issue, but I thought I'd mention it here in case someone with a little more knowledge of this codebase might be able to point me in the right direction.