def string_reverse(str)
  len = str.length - 1
  n = 0
  while n < len do
    # Particularly proud of this since it's essentially language agnostic.
    str[n] ^= str[len]
    str[len] ^= str[n]
    str[n] ^= str[len]
    p str
    p n
    p len
    n += 1
    len -= 1
  end
  return str
end

describe StringRev do
  describe "when a String is passed to the reverse method" do
    it "should return the reverse of that string" do
      string_reverse("Christopher Allen").must_equal "nellA rehpotsirhC"
    end
  end
end