Youtube link

It’s name is COBERTURA. I saw it on the plugins-list of maven.

It can be run as an Ant target or as a standalone. It integrates nicely into maven-reports and here is what it does:

It checks which part of your code is covered by unit-tests. That way you can easily see, really see, where your code needs testing. With maven it generates a Webpage where you can see it’s results. I have added some screenshots of one my projects, it obviously needs more testing.

Here is the package view:

and here is the code view of it: