Thanks for spotting the "Math.round", i've changed it now. Thought I had removed them all before, when was adding the random tests and realised it was causing problems, but one of them obviously snuck through.

No there aren't, all test cases involve words starting with a consonant because the kata is based on spoonerisms and I could think of none where the words started with vowels.

Added some random tests now. Any feedback is welcome.

I'm afraid I don't have time to fix the random test issue right now but I have added an explaination on how spoonerisms work in this kata.

The section before the strong wrangler example now reads "Others, involving words beginning with several consonants are a bit more complex. To make them work we have to swap all consonants up to the first vowel."

Does that make everything clearer?

working on it