fail.rb

require 'minitest/autorun'
require 'date'

class TestDate < MiniTest::Unit::TestCase
  def test_date_roundtrip
    loop do
      dt   = DateTime.now
      time = dt.to_time
      assert_equal format(dt), format(time)
    end
  end

  def format time
    time.strftime("%Y-%m-%d %H:%M:%S.%9N %:z")
  end
end