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_date_arith.rb
    path of file: ./repos/ruby/test/date
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'test/unit'
require 'date'

class TestDateArith < Test::Unit::TestCase
  class Rat < Numeric
    def to_r; self; end
  end

  def test_new_offset
    d = 
    
  def test_new_offset
    d = DateTime.new(2002, 3, 14)
    assert_equal(Rational(9, 24), d.new_offset(Rational(9, 24)).offset)
    assert_equal(Rational(9, 24), d.new_offset('+0900').offset)
    n = Rat.new
    assert_raise(TypeError) do
      Timeout.timeout(1) {d.new_offset(n)}
    end
  end