determin business hour or not with WorkingHours gem

gistfile1.rb

#! /usr/bin/env ruby

require 'working_hours'

WorkingHours::Config.working_hours = {
  mon: {'07:00' => '24:00'},
  tue: {'00:00' => '01:00', '07:00' => '24:00'},
  wed: {'00:00' => '01:00', '07:00' => '24:00'},
  thu: {'00:00' => '01:00', '07:00' => '24:00'},
  fri: {'00:00' => '01:00', '07:00' => '24:00'},
  sat: {'00:00' => '01:00'}
}

WorkingHours::Config.time_zone = 'Tokyo'

WorkingHours::Config.holidays = Date.new(2015, 8, 8)..Date.new(2015, 8,16)

today = Date.today
t = Time.mktime(today.year, today.mon, today.day, 24, 00, 0)
p t + 10.minutes
p WorkingHours.in_working_hours?(t)

power_assertと一緒に読み込むと落ちるという致命的な問題発覚…orz