# File test/src/parser_test.rb, line 27
  def assertGrammarError(code, expected, token_name, lexer, grammar, index=0, line=1, col=1+index)
    parser = lexer.nested(grammar)
    begin
      parser.parse(code)
      assert_fail("error should have happened")
      rescue ParserException => e
        assert_equal(index, e.index)
        msg = expected
        msg = "#{msg}, #{token_name}" << " at line #{line}, col #{col}." unless expected.include? 'at line'
        assert_equal(msg, e.message)
    end
  end