old_contents: """Tests for the saddle-points exercise
  
  Implementation note:
  The saddle_points function must validate the input matrix and raise a
  ValueError with a meaningful error message if the matrix turns out to be
  irregular.
  """
  import unittest
  
  from saddle_points import saddle_points
  
  
  # Tests adapted from `problem-specifications//canonical-data.json` @ v1.0.0
  
  class SaddlePointTest(unittest.TestCase):
      def test_one_saddle(self):
          inp = [[9, 8, 7], [5, 3, 2], [6, 6, 7]]
          self.assertEqual(saddle_points(inp), set([(1, 0)]))
  
      def test_empty_matrix(self):
          self.assertEqual(saddle_points([]), set())
  
      def test_no_saddle(self):
          inp = [[1, 2, 3], [3, 1, 2], [2, 3, 1]]
          self.assertEqual(saddle_points(inp), set())
  
      def test_mult_saddle(self):
          inp = [[4, 5, 4], [3, 5, 5], [1, 5, 4]]
          ans = set([(0, 1), (1, 1), (2, 1)])
          self.assertEqual(saddle_points(inp), ans)
  
      def test_indentify_saddle_bottom_right_corner(self):
          inp = [[8, 7, 9], [6, 7, 6], [3, 2, 5]]
          ans = set([(2, 2)])
          self.assertEqual(saddle_points(inp), ans)
  
      # Additional tests for this track
  
      def test_irregular_matrix(self):
          inp = [[3, 2, 1], [0, 1], [2, 1, 0]]
          with self.assertRaisesWithMessage(ValueError):
              saddle_points(inp)
  
      # Utility functions
      def setUp(self):
          try:
              self.assertRaisesRegex
          except AttributeError:
              self.assertRaisesRegex = self.assertRaisesRegexp
  
      def assertRaisesWithMessage(self, exception):
          return self.assertRaisesRegex(exception, r".+")
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: """Tests for the saddle-points exercise
  
  Implementation note:
  The saddle_points function must validate the input matrix and raise a
  ValueError with a meaningful error message if the matrix turns out to be
  irregular.
  """
  import unittest
  
  from saddle_points import saddle_points
  
  
  # Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0
  
  class SaddlePointTest(unittest.TestCase):
      def test_identify_single_saddle_point(self):
          matrix = [[9, 8, 7], [5, 3, 2], [6, 6, 7]]
          self.assertEqual(saddle_points(matrix), set([(1, 0)]))
  
      def test_empty_matrix_has_no_saddle_points(self):
          self.assertEqual(saddle_points([]), set())
  
      def test_identify_lack_of_saddle_points_when_there_are_none(self):
          matrix = [[1, 2, 3], [3, 1, 2], [2, 3, 1]]
          self.assertEqual(saddle_points(matrix), set())
  
      def test_identify_multiple_saddle_points(self):
          matrix = [[4, 5, 4], [3, 5, 5], [1, 5, 4]]
          expected = set([(0, 1), (1, 1), (2, 1)])
          self.assertEqual(saddle_points(matrix), expected)
  
      def test_identify_saddle_point_in_bottom_right_corner(self):
          matrix = [[8, 7, 9], [6, 7, 6], [3, 2, 5]]
          expected = set([(2, 2)])
          self.assertEqual(saddle_points(matrix), expected)
  
      # Additional tests for this track
  
      def test_irregular_matrix(self):
          matrix = [[3, 2, 1], [0, 1], [2, 1, 0]]
          with self.assertRaisesWithMessage(ValueError):
              saddle_points(matrix)
  
      # Utility functions
      def setUp(self):
          try:
              self.assertRaisesRegex
          except AttributeError:
              self.assertRaisesRegex = self.assertRaisesRegexp
  
      def assertRaisesWithMessage(self, exception):
          return self.assertRaisesRegex(exception, r".+")
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: update tests to v1.1.0 (#1303)