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$KCODE = 'u'

require 'test/unit'

def encode_unicode_codepoints(str)
  str.unpack("U*").map { |b|
    if b >= 128
      "\\u%04x" % b
    else
      b.chr
    end
  }.join
end

class RoflTest < Test::Unit::TestCase
  def test_blah
    str = "こんにちは world ！"
    assert_equal '\u3053\u3093\u306b\u3061\u306f world \uff01', encode_unicode_codepoints(str)
  end
end