I'm trying to understand the same thing right now :-)
I found an sbt-undercover-plugin that uses Undercover to create a pretty nice HTML report to cover the code. I did a great job the first time I used it, but this morning my reports show 0% coverage, so YMMV.
I will update when I find other options.
Edit:
Scala The code coverage tool looks a little more robust. It at least provides its own Maven repo, so you don't need to deploy builds locally on your machines.
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