In statistics, the range of a set of data is the difference between the largest and smallest values.

From the wikipedia link, why do you say range is 0 there?

def please_remember(that)
  if code in comment
    mark_it_as(spoiler)
  end
end

Should return 'Battle Result: No victor on this battle field'
'Should be a tie' is a message when you fail this test case.

You can print the inputs when running the tests, this will help you fix your code.