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_time.rb
    path of file: ./repos/jruby/test/jruby
    
    the code of the file until where you have to start completion: require 'test/unit'
require 'time'

class TestTime < Test::Unit::TestCase

  def test_add_many_under_ms
    t = Time.new(2000, 1, 1, 0, 0, 0)
    t += Rational(123456789, 1_000_000_000)
    assert_equal 123456789, t.nse
    
  def test_tz_without_minutes
    begin
      old_tz, ENV['TZ'] = ENV['TZ'], 'JST-9'
      assert_nothing_raised {
        time = Time.at(86400)
        assert_equal '1970-01-02T09:00:00+0900', time.strftime('%FT%T%z')
      }
    ensure
      ENV['TZ'] = old_tz
    end