If .class files are used to match test classes in the junit batchtest element, then test reordering does not take place.

mstudman: CloverTestSnapshot.calculateDurationOf() needs to be updated to handle .class paths, i believe

mstudman: so currently it doesn't handle them (estimated duration == 0) but then adds the estimate cost of setup/teardown. the result, both ClassATest and ClassBTest appear to take the same length of time hence the non-optimised ordering