TTwo Screen Shots
In itself T2 is just a console application, or you can use it as an API. The second means that you can directly use it from your Junit tests. This is very nice because it means that T2 will integrate with any IDE that supports testing with Junit. I use this kind of integration with Sun's Netbeans IDE.
This screenshot below shows how Netbeans shows the results and coverage of T2 tests.
Running T2 tests inside Netbeans
Measuring test coverage in Netbeans: