Sure. I've added 2 examples and also a note to have a look at the sample tests.

Indeed. Thanks. I added a few test cases.

Thanks. I've added test cases for these.

Thanks, ZED.CWT. I added a few random test cases. Let me know if that's not good enough.

Does every kata need random tests? I'm not sure how to go about this.

Thanks, I've added a test case for that.

Typo: santized → sanitized

Great. I updated the kata so this won't happen to anyone else. Thanks!

Done.

As for the third case: it contains two sentences. You'll have to divide the number of words by 2.

And as for why you're getting the message "should be -1.06 but was -1.06", I'm not sure. Are you returning strings? You could try calling toFixed(2) on the returned value.

permutation is not available like this in ruby 1.9.3.

Your submitted solution works for me, inside codewars, and with ruby 1.8/1.9/2.0/2.1/jruby. I have no idea what the problem is.

However, the code snippet you posted is returning words in a different order than found in the dictionary. Your submitted solution fixes that (with a hack ;).

Returning an empty array is fine. You should try again: I upated the example test cases. If the tests pass, it should go through when submitting.

What test case would you add for instance?