require 'test/unit' class TestRoman < Test::Unit::TestCase NUMBERS = [ [ 1, "i" ], [ 2, "ii" ], [ 3, "iii" ], [ 4, "iv"], [ 5, "v" ], [ 9, "ix" ] ] def test_simple NUMBERS.each do |arabic, roman| r = arabic.to_s assert_equal(roman, r.to_s) end end end