The writing of methods corresponds to that accepted in a particular language: for Javascript camelcase, for Python and Ruby snakecase. Perhaps you solving in Python based on the description for the JS? Because the examples in the description differ depending on the selected language.

See https://www.codewars.com/kata/562086bbaacc2b4d13000047/discuss/javascript#657d1ac4dc8017ba924dd64e

No clue why that solution passes:

// Validate Anakin's hint.
var hint = String(anakin.hint(colors.slice()));
it('Anakin should provide a valid guess', function() {
  if(colorOptions.indexOf(hint) >= 0) {
    chai.assert(true);
  } else {
    chai.expect(false, 'Invalid hint! (' + hint + ')');
  }
});

yes, only positive integers.