Changed the testing code now, can you check again?

It's more that describing a letter as being a vowel or consonant is fundamentally misleading. Those are types of sounds, and letters are not sounds - they're lines on paper or symbols on a screen. One letter can represent several sounds (as is the case with English 'y'), and sometimes multiple letters represent one sound - e.g. the word "hitch" has two consonants; they are written 'h' and 'tch'.

I was taught the same but I learnt something new, the letter Y can be regarded as both a vowel and a consonant. So I opted for vowel in this kata. See wikipedia and http://www.oxforddictionaries.com/words/is-the-letter-y-a-vowel-or-a-consonant for detail.

even i'm getting same output and i think test cases are wrong