old_contents: import unittest
  from hypothesis import given
  from hypothesis.strategies import integers
  from hypothesis.extra.datetime import datetimes
  
  import qual
  
  from datetime import date, MINYEAR, MAXYEAR
  
  class TestIsoUtils(unittest.TestCase):
      @given(datetimes(timezones=[]))
      def test_round_trip_date(self, dt):
          d = dt.date()
          self.assertEqual(qual.iso_to_gregorian(*d.isocalendar()), d)
  
      @given(integers(MINYEAR, MAXYEAR), integers(1, 52), integers(1, 7))
      def test_round_trip_iso_date(self, year, week, day):
          y, w, d = qual.iso_to_gregorian(year, week, day).isocalendar()
          self.assertEqual(year, y)
          self.assertEqual(week, w)
          self.assertEqual(day, d)
  
      @given(integers(MINYEAR, MAXYEAR), integers(54), integers(1, 7))
      def test_weeks_greater_than_53_fail(self, year, week, day):
          self.assertRaises(ValueError, lambda : qual.iso_to_gregorian(year, week, day))
  
new_contents: import unittest
  from hypothesis import given
  from hypothesis.strategies import integers
  from hypothesis.extra.datetime import datetimes
  
  import qual
  
  from datetime import date, MINYEAR, MAXYEAR
  
  class TestIsoUtils(unittest.TestCase):
      @given(datetimes(timezones=[]))
      def test_round_trip_date(self, dt):
          d = dt.date()
          self.assertEqual(qual.iso_to_gregorian(*d.isocalendar()), d)
  
      @given(integers(MINYEAR, MAXYEAR), integers(1, 52), integers(1, 7))
      def test_round_trip_iso_date(self, year, week, day):
          y, w, d = qual.iso_to_gregorian(year, week, day).isocalendar()
          self.assertEqual(year, y)
          self.assertEqual(week, w)
          self.assertEqual(day, d)
  
      @given(integers(MINYEAR, MAXYEAR), integers(54), integers(1, 7))
      def test_weeks_greater_than_53_fail(self, year, week, day):
          self.assertRaises(ValueError, lambda : qual.iso_to_gregorian(year, week, day))
  
      @given(integers(MINYEAR, MAXYEAR), integers(None, 0), integers(1, 7))
      def test_weeks_smaller_than_1_fail(self, year, week, day):
          self.assertRaises(ValueError, lambda : qual.iso_to_gregorian(year, week, day))
  
  
subject: Add a new passing test for invalid week numbers.