old_contents: from datetime import date as vanilla_date
  
  from calendar_testing import CalendarTest
  
  from calexicon.calendars.other import JulianDayNumber
  
  class TestJulianDayNumber(CalendarTest):
      def setUp(self):
          self.calendar = JulianDayNumber()
  
      def test_make_date(self):
          vd = vanilla_date(2010, 8, 1)
          d = self.calendar.from_date(vd)
          self.assertIsNotNone(d)
  
      def test_first_date(self):
          vd = vanilla_date(1, 1, 1)
          d = self.calendar.from_date(vd)
          self.assertEqual(str(d), 'Day 1721423 (Julian Day Number)')
  
      def compare_date_and_number(self, year, month, day, number):
          vd = vanilla_date(year, month, day)
          d = self.calendar.from_date(vd)
          self.assertEqual(d.native_representation(), {'day_number': number})
  
      def test_every_400_years(self):
          days_in_400_years = 400 * 365 + 97
          for i in range(25):
              self.compare_date_and_number(1 + 400 * i, 1, 1, 1721423 + days_in_400_years * i)
  
      def test_first_jan_2000s(self):
          first_jan_2001 = 2451908
          self.compare_date_and_number(2001, 1, 1, first_jan_2001)
          self.compare_date_and_number(2002, 1, 1, first_jan_2001 + 365)
          self.compare_date_and_number(2003, 1, 1, first_jan_2001 + 365 * 2)
          self.compare_date_and_number(2004, 1, 1, first_jan_2001 + 365 * 3)
          self.compare_date_and_number(2005, 1, 1, first_jan_2001 + 365 * 4 + 1)
          self.compare_date_and_number(2006, 1, 1, first_jan_2001 + 365 * 5 + 1)
          self.compare_date_and_number(2007, 1, 1, first_jan_2001 + 365 * 6 + 1)
          self.compare_date_and_number(2008, 1, 1, first_jan_2001 + 365 * 7 + 1)
          self.compare_date_and_number(2009, 1, 1, first_jan_2001 + 365 * 8 + 2)
          self.compare_date_and_number(2010, 1, 1, first_jan_2001 + 365 * 9 + 2)
          self.compare_date_and_number(2011, 1, 1, first_jan_2001 + 365 * 10 + 2)
          self.compare_date_and_number(2012, 1, 1, first_jan_2001 + 365 * 11 + 2)
          self.compare_date_and_number(2013, 1, 1, first_jan_2001 + 365 * 12 + 3)
  
      def test_another_date(self):
          self.compare_date_and_number(2013, 1, 1, 2456293)
  
new_contents: from datetime import date as vanilla_date
  
  from calendar_testing import CalendarTest
  
  from calexicon.calendars.other import JulianDayNumber
  
  class TestJulianDayNumber(CalendarTest):
      def setUp(self):
          self.calendar = JulianDayNumber()
  
      def test_make_date(self):
          vd = vanilla_date(2010, 8, 1)
          d = self.calendar.from_date(vd)
          self.assertIsNotNone(d)
  
      def test_first_date(self):
          vd = vanilla_date(1, 1, 1)
          d = self.calendar.from_date(vd)
          self.assertEqual(str(d), 'Day 1721423 (Julian Day Number)')
  
      def compare_date_and_number(self, year, month, day, number):
          vd = vanilla_date(year, month, day)
          d = self.calendar.from_date(vd)
          self.assertEqual(d.native_representation(), {'day_number': number})
  
      def test_every_400_years(self):
          days_in_400_years = 400 * 365 + 97
          for i in range(25):
              self.compare_date_and_number(1 + 400 * i, 1, 1, 1721423 + days_in_400_years * i)
  
      def test_first_jan_2000s(self):
          first_jan_2001 = 2451908
          self.compare_date_and_number(2001, 1, 1, first_jan_2001)
          self.compare_date_and_number(2002, 1, 1, first_jan_2001 + 365)
          self.compare_date_and_number(2003, 1, 1, first_jan_2001 + 365 * 2)
          self.compare_date_and_number(2004, 1, 1, first_jan_2001 + 365 * 3)
          self.compare_date_and_number(2005, 1, 1, first_jan_2001 + 365 * 4 + 1)
          self.compare_date_and_number(2006, 1, 1, first_jan_2001 + 365 * 5 + 1)
          self.compare_date_and_number(2007, 1, 1, first_jan_2001 + 365 * 6 + 1)
          self.compare_date_and_number(2008, 1, 1, first_jan_2001 + 365 * 7 + 1)
          self.compare_date_and_number(2009, 1, 1, first_jan_2001 + 365 * 8 + 2)
          self.compare_date_and_number(2010, 1, 1, first_jan_2001 + 365 * 9 + 2)
          self.compare_date_and_number(2011, 1, 1, first_jan_2001 + 365 * 10 + 2)
          self.compare_date_and_number(2012, 1, 1, first_jan_2001 + 365 * 11 + 2)
          self.compare_date_and_number(2013, 1, 1, first_jan_2001 + 365 * 12 + 3)
  
      def test_another_date(self):
          self.compare_date_and_number(2013, 1, 1, 2456291)
  
subject: Correct the Julian day number of 2013-01-01.