You don't need to configure anything for code coverage to work. TestBox will auto-detect if FusionReactor is installed on your server and will generate the code coverage results for you. In the output of your test reporter, you will see a percentage to represents the number of lines of code (LOC) which were executed divided by the total number of lines of code. Note, code coverage only counts executable lines of code against you, so comments, whitespace, or HTML do not count as an executable LOC.