Test with Eclemma coverage

[willhains]

I have no idea how you'd do this, but if the Eclemma plugin is installed, launch the JUnitLoop test suite in coverage mode.

Given that Eclemma can highlight the code that isn't being covered (with some careful toning down of the annotations and colours it uses, it is not overly distracting or annoying), it would be a great way to get feedback on whether you need to add some more tests.