The description often leaves room for interpretation. When solving easy kata takes longer than reading the description you should re-read the description.
Define camelcase here is important. "WhatIfAWordBeginsWithCap" or "Word withSpaces".
Camelcase does not start with capitol, does not contain spaces(or punctuation stuff), contains at least one uppercase letter.

To * or not to *.

How about test cases "True, True" and "True, False" ?
Going back to description ... 'only strings or numbers' ... (sigh).

Name of function 'sum_two_smallest_numbers' made me suspicious (what if there is negative in array, or less 2 elements), re-reading the description, ok ok :)