Be careful about list of empty string: Arrays.asList("") and new ArrayList<String>() will be displayed in the exact same way in the assertion messages, while they are clearly not equal.

You won't be giving away possible solutions.
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then it will hide your comment from people who haven't solved the kata.

Try printing the input and figuring out why. I don't know why your code doesn't pass, you don't even say, but your code can be wrong or be inefficient and then only passes the sample tests and not the full suite.