old_contents: from datetime import date
  
  from pyQuantuccia import calendar
  
  
  def test_united_kingdom_is_business_day():
      """ Check a single day to see that we
      can identify holidays.
      """
      assert(calendar.united_kingdom_is_business_day(date(2017, 4, 17)) is False)
  
new_contents: from datetime import date
  
  from pyQuantuccia import calendar
  
  
  def test_united_kingdom_is_business_day_identifies_a_holiday():
      """ Check a single day to see that we
      can identify holidays.
      """
      assert(calendar.united_kingdom_is_business_day(date(2017, 4, 17)) is False)
  
  def test_united_kingdom_is_business_day_identifies_a_business_day():
      """ Check a single day to see that we
      can identify holidays.
      """
      assert(calendar.united_kingdom_is_business_day(date(2017, 6, 19)) is True)
  
subject: Add another test.