if the string contains 2 spaces this code will return 1

function wordCount(str) { return (str.split(" ")).length; }

I think that the tests are not strict enough, I think my answer is not supposed to pass, since it is not symmetrical

Anyway, great Kata ! I'm still trying to find a better answer !

Awesome! The custom matcher is working well.

Done! The test cases now rely on a custom assertSimilarUnsorted matcher :)

Glad you like it :)
Good call fir the order, however I'm stuck because there is no Test matcher that would do the job, I will try to add another prototype method to Test.

I like this kata so far. My only question is whether the order of the solution array should matter. I'm getting the following error message:

Test Failed: Expected: [["tsar","star","tars"],["rat","tar"],["cheese"]], instead got: [["rat","tar"],["tsar","star","tars"],["cheese"]]

The groupings seem to be correct, but should I be penalized for having them in a different order?

You sugguest more test cases in the Kata description ?
Or in the solution test cases ?

Maybe provide more test cases.
Is tagging already done ?