I tried to use the code coverage feature but I could never get any results to show up. I complained about this before the IDEA 6 release, but I was told I must be configuring it wrong. I've never looked back into it, but today as I was browsing my file system, I noticed a "\" directory in the same directory as the IDEA project I tried to use code coverage with. I discovered that IDEA has created this directory hierarchy in my project's directory: "\" / Users / (my user name) / Library / Caches / IntelliJIDEA60 / coverage and the metadata is in the "coverage" directory.