I got that in the random tests (happens pretty rarely):

'465 Millions, 001 Thousand, 7 Hundreds, 5 Tens, 2 Units' 
    should equal
'465 Millions, 001 Thousands, 7 Hundreds, 5 Tens, 2 Units'

either your solution is incorrect, or you have to specify that edge case (I personnally have no idea which one is correct english...)

Why the 002 Thousands thing? There is not point having those leading zeroes (except to make your solution "valid"? :/ )

A random test:

'431 Millions, 001 Thousand, 2 Hundreds, 3 Tens, 0 Units' should equal '431 Millions, 001 Thousands, 2 Hundreds, 3 Tens, 0 Units'

An invalid input should return None

It's not clear what "invalid" means here, and the input validation should be removed altogether.

Hi,

Well... We already have several katas (some listed here) (but a bit more complex) covering that kind of task.

Additionnal problems:

• labels alignemnts are completely inconsistent with the ones of the columns
• you don't give precise enough specifications, about the formatting (columns widths)
• what's the point of the validation???
• by comparing ZED's solution and mine, the validation isn't properly tested

I'd advise you to read those, if not already done (to get a better idea about what has a chance or not to be welcomed in the beta process):

• https://github.com/codewars/codewars.com/wiki/Kata-Creator
• https://github.com/codewars/codewars.com/wiki/Tutorial%3A-Create-Your-First-Kata

cheers