main.rb

gem 'cucumber'

def is_palindrome(str)
  if str.downcase.reverse == str.downcase
    puts('palindrome')
  else
    puts('NOT a palindrome')
  end
end

puts 'Enter a string'
input_str = gets
is_palindrome(input_str.chomp)

test.feature

Feature: lower case palindromes
  This is testing the input of lower case strings
  that may be palindromes

  Scenario: testing lowercase
    Given I am string hello
    When I input a string
    Then is should not be a palindrome