You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_jisx0208.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/tool/test
    
    the code of the file until where you have to start completion: require 'test/unit'

require_relative '../lib/jisx0208'

class Test_JISX0208_Char < Test::Unit::TestCase
  def test_create_with_row_cell
    assert_equal JI
    
  def test_from_sjis
    assert_raise(ArgumentError) { JISX0208::Char.from_sjis(-1) }
    assert_raise(ArgumentError) { JISX0208::Char.from_sjis(0x10000) }
    assert_nothing_raised { JISX0208::Char.from_sjis(0x8140) }
    assert_nothing_raised { JISX0208::Char.from_sjis(0xFCFC) }
    assert_equal JISX0208::Char.new(0x313D), JISX0208::Char.from_sjis(0x895C)
  end