If that's the case, lazy me just wants to then wrap this in an ArrayList and proceed as I did.

OK. I will update the description if you give an example where it makes any difference:

• e.g. one hundred one, one hundred two is same order as one hundred and one, one hundred and two
• e.g. ninety eight, ninety nine is same order as ninety-eight, ninety-nine

Yes, thank you. It's amazing how one task can be solved differently with functional programming.
Powerful tool.

ok, good. So that effectively was the test with the string. ;)

Mmmmh... That one (issue) might be tricky to sort out, I fear... :/ There effectively is an assertion on strings in this test, but it seems you're failing the one just before, which is on the Counter instance itself instead.

assertEquals( expected1, c);
assertEquals( "Counter(" + expected1.toString() + ")", c.toString());    <<< seems you don't see this one yet.

I'll try to figure out why I put the second one in there (EDIT: I just commented it out for now. How is it now on your side?), but the fact that you fail the previous one is a bit surprising.

I need more informations, for now:

• what are the other tests you're currently failing at?
• could you copy/paste the exact assertion message, plz?

woops... x)
Return a fresh instance, please. Description updated, thx!

I'm a patient man.

All inputs are positive