I can get code coverage results inside of xcode with a new toy project. When I try with an existing app with tests, the tests are run (I see output, breakpoints hit), but the coverage window in the report navigator says "No Coverage Data" and nothing shows in the source editor sidebars. The "Gather Coverage Data" box is ticked in the scheme.
Actually having a worse error testing my toy Framework
Maybe you can help me with this.
I've personally seen code coverage results for some very large projects. Right now the support works best for applications and frameworks. If that's what you're testing, then it would be best if you could file a bug report at <https://bugreport.apple.com> so that we can investigate your particular circumstances. For that matter, a bug report would be a good thing no matter what type of project you have. If possible, it's best to actually in the project with the report. If you can't do that, describe its setup in as much detail as possible. Pictures are good.