require "abstract_unit"

module DateAndTimeBehavior
  def test_yesterday
    assert_equal date_time_init(2005, 2, 21, 10, 10, 10), date_time_init(2005, 2, 22, 10, 10, 10).yesterday
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10), date_time_init(2005, 3, 2, 10, 10, 10).yesterday.yesterday
  end

  def test_prev_day
    assert_equal date_time_init(2005, 2, 21, 10, 10, 10), date_time_init(2005, 2, 22, 10, 10, 10).prev_day
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10), date_time_init(2005, 3, 2, 10, 10, 10).prev_day.prev_day
  end

  def test_tomorrow
    assert_equal date_time_init(2005, 2, 23, 10, 10, 10), date_time_init(2005, 2, 22, 10, 10, 10).tomorrow
    assert_equal date_time_init(2005, 3, 2, 10, 10, 10),  date_time_init(2005, 2, 28, 10, 10, 10).tomorrow.tomorrow
  end

  def test_next_day
    assert_equal date_time_init(2005, 2, 23, 10, 10, 10), date_time_init(2005, 2, 22, 10, 10, 10).next_day
    assert_equal date_time_init(2005, 3, 2, 10, 10, 10),  date_time_init(2005, 2, 28, 10, 10, 10).next_day.next_day
  end

  def test_days_ago
    assert_equal date_time_init(2005, 6, 4, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).days_ago(1)
    assert_equal date_time_init(2005, 5, 31, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).days_ago(5)
  end

  def test_days_since
    assert_equal date_time_init(2005, 6, 6, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).days_since(1)
    assert_equal date_time_init(2005, 1, 1, 10, 10, 10), date_time_init(2004, 12, 31, 10, 10, 10).days_since(1)
  end

  def test_weeks_ago
    assert_equal date_time_init(2005, 5, 29, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).weeks_ago(1)
    assert_equal date_time_init(2005, 5, 1, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).weeks_ago(5)
    assert_equal date_time_init(2005, 4, 24, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).weeks_ago(6)
    assert_equal date_time_init(2005, 2, 27, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).weeks_ago(14)
    assert_equal date_time_init(2004, 12, 25, 10, 10, 10), date_time_init(2005, 1, 1, 10, 10, 10).weeks_ago(1)
  end

  def test_weeks_since
    assert_equal date_time_init(2005, 7, 14, 10, 10, 10), date_time_init(2005, 7, 7, 10, 10, 10).weeks_since(1)
    assert_equal date_time_init(2005, 7, 14, 10, 10, 10), date_time_init(2005, 7, 7, 10, 10, 10).weeks_since(1)
    assert_equal date_time_init(2005, 7, 4, 10, 10, 10),  date_time_init(2005, 6, 27, 10, 10, 10).weeks_since(1)
    assert_equal date_time_init(2005, 1, 4, 10, 10, 10),  date_time_init(2004, 12, 28, 10, 10, 10).weeks_since(1)
  end

  def test_months_ago
    assert_equal date_time_init(2005, 5, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).months_ago(1)
    assert_equal date_time_init(2004, 11, 5, 10, 10, 10), date_time_init(2005, 6, 5, 10, 10, 10).months_ago(7)
    assert_equal date_time_init(2004, 12, 5, 10, 10, 10), date_time_init(2005, 6, 5, 10, 10, 10).months_ago(6)
    assert_equal date_time_init(2004, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).months_ago(12)
    assert_equal date_time_init(2003, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).months_ago(24)
  end

  def test_months_since
    assert_equal date_time_init(2005, 7, 5, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).months_since(1)
    assert_equal date_time_init(2006, 1, 5, 10, 10, 10),   date_time_init(2005, 12, 5, 10, 10, 10).months_since(1)
    assert_equal date_time_init(2005, 12, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).months_since(6)
    assert_equal date_time_init(2006, 6, 5, 10, 10, 10),   date_time_init(2005, 12, 5, 10, 10, 10).months_since(6)
    assert_equal date_time_init(2006, 1, 5, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).months_since(7)
    assert_equal date_time_init(2006, 6, 5, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).months_since(12)
    assert_equal date_time_init(2007, 6, 5, 10, 10, 10),   date_time_init(2005, 6, 5, 10, 10, 10).months_since(24)
    assert_equal date_time_init(2005, 4, 30, 10, 10, 10),  date_time_init(2005, 3, 31, 10, 10, 10).months_since(1)
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10),  date_time_init(2005, 1, 29, 10, 10, 10).months_since(1)
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10),  date_time_init(2005, 1, 30, 10, 10, 10).months_since(1)
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10),  date_time_init(2005, 1, 31, 10, 10, 10).months_since(1)
  end

  def test_years_ago
    assert_equal date_time_init(2004, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).years_ago(1)
    assert_equal date_time_init(1998, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).years_ago(7)
    assert_equal date_time_init(2003, 2, 28, 10, 10, 10), date_time_init(2004, 2, 29, 10, 10, 10).years_ago(1) # 1 year ago from leap day
  end

  def test_years_since
    assert_equal date_time_init(2006, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).years_since(1)
    assert_equal date_time_init(2012, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).years_since(7)
    assert_equal date_time_init(2005, 2, 28, 10, 10, 10), date_time_init(2004, 2, 29, 10, 10, 10).years_since(1) # 1 year since leap day
    assert_equal date_time_init(2182, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).years_since(177)
  end

  def test_beginning_of_month
    assert_equal date_time_init(2005, 2, 1, 0, 0, 0), date_time_init(2005, 2, 22, 10, 10, 10).beginning_of_month
  end

  def test_beginning_of_quarter
    assert_equal date_time_init(2005, 1, 1, 0, 0, 0),  date_time_init(2005, 2, 15, 10, 10, 10).beginning_of_quarter
    assert_equal date_time_init(2005, 1, 1, 0, 0, 0),  date_time_init(2005, 1, 1, 0, 0, 0).beginning_of_quarter
    assert_equal date_time_init(2005, 10, 1, 0, 0, 0), date_time_init(2005, 12, 31, 10, 10, 10).beginning_of_quarter
    assert_equal date_time_init(2005, 4, 1, 0, 0, 0),  date_time_init(2005, 6, 30, 23, 59, 59).beginning_of_quarter
  end

  def test_end_of_quarter
    assert_equal date_time_init(2007, 3, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 2, 15, 10, 10, 10).end_of_quarter
    assert_equal date_time_init(2007, 3, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 3, 31, 0, 0, 0).end_of_quarter
    assert_equal date_time_init(2007, 12, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 12, 21, 10, 10, 10).end_of_quarter
    assert_equal date_time_init(2007, 6, 30, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 4, 1, 0, 0, 0).end_of_quarter
    assert_equal date_time_init(2008, 6, 30, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2008, 5, 31, 0, 0, 0).end_of_quarter
  end

  def test_beginning_of_year
    assert_equal date_time_init(2005, 1, 1, 0, 0, 0), date_time_init(2005, 2, 22, 10, 10, 10).beginning_of_year
  end

  def test_next_week
    #   M   |   T  | W | T | F | S | S #   M   | T |   W   | T |  F  | S | S #
    #       | 22/2 |   |   |   |   |   # 28/2  |   |       |   |     |   |   # monday in next week `next_week`
    #       | 22/2 |   |   |   |   |   #       |   |       |   | 4/3 |   |   # friday in next week `next_week(:friday)`
    # 23/10 |      |   |   |   |   |   # 30/10 |   |       |   |     |   |   # monday in next week `next_week`
    # 23/10 |      |   |   |   |   |   #       |   |  1/11 |   |     |   |   # wednesday in next week `next_week(:wednesday)`
    assert_equal date_time_init(2005, 2, 28, 0, 0, 0),  date_time_init(2005, 2, 22, 15, 15, 10).next_week
    assert_equal date_time_init(2005, 3, 4, 0, 0, 0),   date_time_init(2005, 2, 22, 15, 15, 10).next_week(:friday)
    assert_equal date_time_init(2006, 10, 30, 0, 0, 0), date_time_init(2006, 10, 23, 0, 0, 0).next_week
    assert_equal date_time_init(2006, 11, 1, 0, 0, 0),  date_time_init(2006, 10, 23, 0, 0, 0).next_week(:wednesday)
  end

  def test_next_week_with_default_beginning_of_week_set
    with_bw_default(:tuesday) do
      assert_equal Time.local(2012, 3, 28), Time.local(2012, 3, 21).next_week(:wednesday)
      assert_equal Time.local(2012, 3, 31), Time.local(2012, 3, 21).next_week(:saturday)
      assert_equal Time.local(2012, 3, 27), Time.local(2012, 3, 21).next_week(:tuesday)
      assert_equal Time.local(2012, 4, 02), Time.local(2012, 3, 21).next_week(:monday)
    end
  end

  def test_next_week_at_same_time
    assert_equal date_time_init(2005, 2, 28, 15, 15, 10), date_time_init(2005, 2, 22, 15, 15, 10).next_week(:monday, same_time: true)
    assert_equal date_time_init(2005, 2, 28, 15, 15, 10, 999999), date_time_init(2005, 2, 22, 15, 15, 10, 999999).next_week(:monday, same_time: true)
    assert_equal date_time_init(2005, 2, 28, 15, 15, 10, Rational(999999999, 1000)), date_time_init(2005, 2, 22, 15, 15, 10, Rational(999999999, 1000)).next_week(:monday, same_time: true)
    assert_equal date_time_init(2005, 3, 4, 15, 15, 10),   date_time_init(2005, 2, 22, 15, 15, 10).next_week(:friday, same_time: true)
    assert_equal date_time_init(2006, 10, 30, 0, 0, 0), date_time_init(2006, 10, 23, 0, 0, 0).next_week(:monday, same_time: true)
    assert_equal date_time_init(2006, 11, 1, 0, 0, 0),  date_time_init(2006, 10, 23, 0, 0, 0).next_week(:wednesday, same_time: true)
  end

  def test_next_weekday_on_wednesday
    assert_equal date_time_init(2015, 1, 8, 0, 0, 0), date_time_init(2015, 1, 7, 0, 0, 0).next_weekday
    assert_equal date_time_init(2015, 1, 8, 15, 15, 10), date_time_init(2015, 1, 7, 15, 15, 10).next_weekday
  end

  def test_next_weekday_on_friday
    assert_equal date_time_init(2015, 1, 5, 0, 0, 0), date_time_init(2015, 1, 2, 0, 0, 0).next_weekday
    assert_equal date_time_init(2015, 1, 5, 15, 15, 10), date_time_init(2015, 1, 2, 15, 15, 10).next_weekday
  end

  def test_next_weekday_on_saturday
    assert_equal date_time_init(2015, 1, 5, 0, 0, 0), date_time_init(2015, 1, 3, 0, 0, 0).next_weekday
    assert_equal date_time_init(2015, 1, 5, 15, 15, 10), date_time_init(2015, 1, 3, 15, 15, 10).next_weekday
  end

  def test_next_month_on_31st
    assert_equal date_time_init(2005, 9, 30, 15, 15, 10), date_time_init(2005, 8, 31, 15, 15, 10).next_month
  end

  def test_next_quarter_on_31st
    assert_equal date_time_init(2005, 11, 30, 15, 15, 10), date_time_init(2005, 8, 31, 15, 15, 10).next_quarter
  end

  def test_next_year
    assert_equal date_time_init(2006, 6, 5, 10, 10, 10), date_time_init(2005, 6, 5, 10, 10, 10).next_year
  end

  def test_prev_week
    assert_equal date_time_init(2005, 2, 21, 0, 0, 0),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week
    assert_equal date_time_init(2005, 2, 22, 0, 0, 0),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week(:tuesday)
    assert_equal date_time_init(2005, 2, 25, 0, 0, 0),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week(:friday)
    assert_equal date_time_init(2006, 10, 30, 0, 0, 0), date_time_init(2006, 11, 6, 0, 0, 0).prev_week
    assert_equal date_time_init(2006, 11, 15, 0, 0, 0), date_time_init(2006, 11, 23, 0, 0, 0).prev_week(:wednesday)
  end

  def test_prev_week_with_default_beginning_of_week
    with_bw_default(:tuesday) do
      assert_equal Time.local(2012, 3, 14), Time.local(2012, 3, 21).prev_week(:wednesday)
      assert_equal Time.local(2012, 3, 17), Time.local(2012, 3, 21).prev_week(:saturday)
      assert_equal Time.local(2012, 3, 13), Time.local(2012, 3, 21).prev_week(:tuesday)
      assert_equal Time.local(2012, 3, 19), Time.local(2012, 3, 21).prev_week(:monday)
    end
  end

  def test_prev_week_at_same_time
    assert_equal date_time_init(2005, 2, 21, 15, 15, 10),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week(:monday, same_time: true)
    assert_equal date_time_init(2005, 2, 22, 15, 15, 10),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week(:tuesday, same_time: true)
    assert_equal date_time_init(2005, 2, 25, 15, 15, 10),  date_time_init(2005, 3, 1, 15, 15, 10).prev_week(:friday, same_time: true)
    assert_equal date_time_init(2006, 10, 30, 0, 0, 0), date_time_init(2006, 11, 6, 0, 0, 0).prev_week(:monday, same_time: true)
    assert_equal date_time_init(2006, 11, 15, 0, 0, 0), date_time_init(2006, 11, 23, 0, 0, 0).prev_week(:wednesday, same_time: true)
  end

  def test_prev_weekday_on_wednesday
    assert_equal date_time_init(2015, 1, 6, 0, 0, 0), date_time_init(2015, 1, 7, 0, 0, 0).prev_weekday
    assert_equal date_time_init(2015, 1, 6, 15, 15, 10), date_time_init(2015, 1, 7, 15, 15, 10).prev_weekday
  end

  def test_prev_weekday_on_monday
    assert_equal date_time_init(2015, 1, 2, 0, 0, 0), date_time_init(2015, 1, 5, 0, 0, 0).prev_weekday
    assert_equal date_time_init(2015, 1, 2, 15, 15, 10), date_time_init(2015, 1, 5, 15, 15, 10).prev_weekday
  end

  def test_prev_weekday_on_sunday
    assert_equal date_time_init(2015, 1, 2, 0, 0, 0), date_time_init(2015, 1, 4, 0, 0, 0).prev_weekday
    assert_equal date_time_init(2015, 1, 2, 15, 15, 10), date_time_init(2015, 1, 4, 15, 15, 10).prev_weekday
  end

  def test_prev_month_on_31st
    assert_equal date_time_init(2004, 2, 29, 10, 10, 10), date_time_init(2004, 3, 31, 10, 10, 10).prev_month
  end

  def test_prev_quarter_on_31st
    assert_equal date_time_init(2004, 2, 29, 10, 10, 10), date_time_init(2004, 5, 31, 10, 10, 10).prev_quarter
  end

  def test_prev_year
    assert_equal date_time_init(2004, 6, 5, 10, 10, 10),  date_time_init(2005, 6, 5, 10, 10, 10).prev_year
  end

  def test_days_to_week_start
    assert_equal 0, date_time_init(2011, 11, 01, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 1, date_time_init(2011, 11, 02, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 2, date_time_init(2011, 11, 03, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 3, date_time_init(2011, 11, 04, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 4, date_time_init(2011, 11, 05, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 5, date_time_init(2011, 11, 06, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 6, date_time_init(2011, 11, 07, 0, 0, 0).days_to_week_start(:tuesday)

    assert_equal 3, date_time_init(2011, 11, 03, 0, 0, 0).days_to_week_start(:monday)
    assert_equal 3, date_time_init(2011, 11, 04, 0, 0, 0).days_to_week_start(:tuesday)
    assert_equal 3, date_time_init(2011, 11, 05, 0, 0, 0).days_to_week_start(:wednesday)
    assert_equal 3, date_time_init(2011, 11, 06, 0, 0, 0).days_to_week_start(:thursday)
    assert_equal 3, date_time_init(2011, 11, 07, 0, 0, 0).days_to_week_start(:friday)
    assert_equal 3, date_time_init(2011, 11, 8, 0, 0, 0).days_to_week_start(:saturday)
    assert_equal 3, date_time_init(2011, 11, 9, 0, 0, 0).days_to_week_start(:sunday)
  end

  def test_days_to_week_start_with_default_set
    with_bw_default(:friday) do
      assert_equal 6, Time.local(2012, 03, 8, 0, 0, 0).days_to_week_start
      assert_equal 5, Time.local(2012, 03, 7, 0, 0, 0).days_to_week_start
      assert_equal 4, Time.local(2012, 03, 6, 0, 0, 0).days_to_week_start
      assert_equal 3, Time.local(2012, 03, 5, 0, 0, 0).days_to_week_start
      assert_equal 2, Time.local(2012, 03, 4, 0, 0, 0).days_to_week_start
      assert_equal 1, Time.local(2012, 03, 3, 0, 0, 0).days_to_week_start
      assert_equal 0, Time.local(2012, 03, 2, 0, 0, 0).days_to_week_start
    end
  end

  def test_beginning_of_week
    assert_equal date_time_init(2005, 1, 31, 0, 0, 0),  date_time_init(2005, 2, 4, 10, 10, 10).beginning_of_week
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 11, 28, 0, 0, 0).beginning_of_week #monday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 11, 29, 0, 0, 0).beginning_of_week #tuesday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 11, 30, 0, 0, 0).beginning_of_week #wednesday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 12, 01, 0, 0, 0).beginning_of_week #thursday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 12, 02, 0, 0, 0).beginning_of_week #friday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 12, 03, 0, 0, 0).beginning_of_week #saturday
    assert_equal date_time_init(2005, 11, 28, 0, 0, 0), date_time_init(2005, 12, 04, 0, 0, 0).beginning_of_week #sunday
  end

  def test_end_of_week
    assert_equal date_time_init(2008, 1, 6, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 12, 31, 10, 10, 10).end_of_week
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 8, 27, 0, 0, 0).end_of_week #monday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 8, 28, 0, 0, 0).end_of_week #tuesday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 8, 29, 0, 0, 0).end_of_week #wednesday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 8, 30, 0, 0, 0).end_of_week #thursday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 8, 31, 0, 0, 0).end_of_week #friday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 9, 01, 0, 0, 0).end_of_week #saturday
    assert_equal date_time_init(2007, 9, 2, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 9, 02, 0, 0, 0).end_of_week #sunday
  end

  def test_end_of_month
    assert_equal date_time_init(2005, 3, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2005, 3, 20, 10, 10, 10).end_of_month
    assert_equal date_time_init(2005, 2, 28, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2005, 2, 20, 10, 10, 10).end_of_month
    assert_equal date_time_init(2005, 4, 30, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2005, 4, 20, 10, 10, 10).end_of_month
  end

  def test_end_of_year
    assert_equal date_time_init(2007, 12, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 2, 22, 10, 10, 10).end_of_year
    assert_equal date_time_init(2007, 12, 31, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2007, 12, 31, 10, 10, 10).end_of_year
  end

  def test_monday_with_default_beginning_of_week_set
    with_bw_default(:saturday) do
      assert_equal date_time_init(2012, 9, 17, 0, 0, 0), date_time_init(2012, 9, 18, 0, 0, 0).monday
    end
  end

  def test_sunday_with_default_beginning_of_week_set
    with_bw_default(:wednesday) do
      assert_equal date_time_init(2012, 9, 23, 23, 59, 59, Rational(999999999, 1000)), date_time_init(2012, 9, 19, 0, 0, 0).sunday
    end
  end

  def test_on_weekend_on_saturday
    assert date_time_init(2015, 1, 3, 0, 0, 0).on_weekend?
    assert date_time_init(2015, 1, 3, 15, 15, 10).on_weekend?
  end

  def test_on_weekend_on_sunday
    assert date_time_init(2015, 1, 4, 0, 0, 0).on_weekend?
    assert date_time_init(2015, 1, 4, 15, 15, 10).on_weekend?
  end

  def test_on_weekend_on_monday
    assert_not date_time_init(2015, 1, 5, 0, 0, 0).on_weekend?
    assert_not date_time_init(2015, 1, 5, 15, 15, 10).on_weekend?
  end

  def test_on_weekday_on_sunday
    assert_not date_time_init(2015, 1, 4, 0, 0, 0).on_weekday?
    assert_not date_time_init(2015, 1, 4, 15, 15, 10).on_weekday?
  end

  def test_on_weekday_on_monday
    assert date_time_init(2015, 1, 5, 0, 0, 0).on_weekday?
    assert date_time_init(2015, 1, 5, 15, 15, 10).on_weekday?
  end

  def with_bw_default(bw = :monday)
    old_bw = Date.beginning_of_week
    Date.beginning_of_week = bw
    yield
  ensure
    Date.beginning_of_week = old_bw
  end
end
