numberish.rb

numberish.rb

class Numberish
  def self.convert(input)
    if input.to_i > 0 && input.to_i.to_s == input
      return input.to_i
    else
      return input
    end
  end
end

if $0 == __FILE__
  require 'test/unit'
  
  class TestNumberish < Test::Unit::TestCase
    def test_1
      assert_equal 1, Numberish.convert("1")
    end
    
    def test_plus_1
      assert_equal "+1", Numberish.convert("+1")
    end
    
    def test_auto
      assert_equal "auto", Numberish.convert("auto")
    end
    
    def test_negative_1
      assert_equal "-1", Numberish.convert("-1")
    end
  end
end