Closing.

109 is not decrementing, 1 > 0 but 0 < 9, check the description again:

‡ For decrementing sequences, 0 should come after 1, and not before 9, as in 3210.

have you tried printing the inputs?

I'm not saying it's impossible but, a good indicator about the testing being faulty or not is the number of completions:

Java Completions 3048

With that many, the chances of the testing being faulty are very slim. And yes, those brackets in Java are somewhat strange, but that's how it works in JUnit to highlight the difference. Cheers.

That you missed 1306 in your returned value. That's how Java testing framework shows the difference. Use Question label next time when the problem is with your code and not with the kata.