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class Schedule
  def scheduled?(schedulable, start_date, end_date)
    puts "This #{schedulable.class} " + "is not scheduled\n" + " between #{start_date} and #{end_date}"
    false
  end
end

class Bicycle
  attr_reader :schedule, :size, :chain, :tire_size

  # Scheduleを注入し、初期値を設定する
  def initialize(args={})
    @schedule = args[:schedule] || Schedule.new
    # ...
  end

  # 与えられた期間（現在はBicycleに固有）の間、
  # bicycleが利用可能であればtrueを返す
  def schedulable?(start_date, end_date)
    !scheduled?(start_date - lead_days, end_date)
  end

  # scheduleの答えを返す
  def scheduled?(start_date, end_date)
    schedule.scheduled?(self, start_date, end_date)
  end

  # bicycleがスケジュール可能となるまでの
  # 準備日数を返す
  def lead_days
    1
  end
end

require 'date'
starting = Date.parse("2015/09/04")
ending   = Date.parse("2015/09/10")

b = Bicycle.new
b.schedulable?(starting, ending)
# This Bicycle is not scheduled
#   between 2015-09-03 and 2015-09-10
#  => true

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class Hoge
  include ModuleA
  include ModuleB
end