You are really right. I did not know that

There are no random tests.

The more likely reason is that kata author is not well-versed on the subject and think that it's actually pretty simple. Which it's not.

Also gonna be fun when writing random tests, which there isn't any at the moment.

fixed

The arguments of assertEquals are in the wrong order.

And it's an overloaded character that may or may not be a quote. It technically isn't a quote when it's inside a word or an abbreviation.
And not all the cases in the tests are abbreviations, possessives aren't. There are all kinds of edge cases in various languages too, for instance, plural possessives in English, so it should be specified if they are tested or not.

leave single quotes in abbreviations of words

Define "word abbreviations".

Why is is and has only abbreviated after he/she? English does not work this way.

Bad premise, bad specs, bad testing.

Not a good kata.

You should use Test.assertEquals instead of Test.expect.

Changing output format doesn't change the task.

Edit: noticed filtering out the 0's, but in that case the description is lacking; also this change is basically "add one if statement to your code", so it's still way too similar.

done

done