Unlike the in-repo addons we have in our main repository, we also have actual addons with files in addon and app. When using the beta version, all app files are still covered, but the addon files aren't anymore. I've tried to resolve this with modifyAssetLocation (we don't need the --path option in the actual addons), but all relativePaths contained dummy (corresponding to app). So, it seems like the coverage is not only not reported, it's also not calculated at all anymore.

I was quite surprised that this wasn't covered by the tests, as I do see my-addon in the test-packages. However, that repo isn't used in any test, and I couldn't get a simple test working, so I guess that would need some more investigation.

The Readme does mention how to setup instrumentation in in-repo addons, but it doesn't mention that this same setup also applies to actual/standalone addons. In such addons that have app files (like our addon does) there is no setup example as well . It can be inferred from the other examples, but having it mentioned explicitly definitely helps with the setup.