Added rudimentary support for single method execution. The current dsl looks like this:

test.selection.includeMethod 'someTestMethod'

More work is pending.
Removed a unit test that did not add any value. It was just mocks carnage that mirrored the implementation. The implementation does not seem to have anything useful to unit test, maybe aside from junit category verification which is somewhat awkward to test (and it wasn't covered anyway in the deleted unit test).