a5f970524b
There is a test for multiple saddle points in a column, but there is no test for multiple points in a row. These changes rename the existing test to indicate it tests for saddle points in a column and adds a test for multiple points in a row.
62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
"""Tests for the saddle-points exercise
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Implementation note:
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The saddle_points function must validate the input matrix and raise a
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ValueError with a meaningful error message if the matrix turns out to be
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irregular.
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"""
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import unittest
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from saddle_points import saddle_points
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# Tests adapted from `problem-specifications//canonical-data.json` @ v1.2.0
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class SaddlePointsTest(unittest.TestCase):
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def test_identify_single_saddle_point(self):
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matrix = [[9, 8, 7], [5, 3, 2], [6, 6, 7]]
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self.assertEqual(saddle_points(matrix), set([(1, 0)]))
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def test_empty_matrix_has_no_saddle_points(self):
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self.assertEqual(saddle_points([]), set())
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def test_identify_lack_of_saddle_points_when_there_are_none(self):
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matrix = [[1, 2, 3], [3, 1, 2], [2, 3, 1]]
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self.assertEqual(saddle_points(matrix), set())
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def test_identify_multiple_saddle_points_in_column(self):
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matrix = [[4, 5, 4], [3, 5, 5], [1, 5, 4]]
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expected = set([(0, 1), (1, 1), (2, 1)])
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self.assertEqual(saddle_points(matrix), expected)
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def test_identify_multiple_saddle_points_in_row(self):
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matrix = [[6, 7, 8], [5, 5, 5], [7, 5, 6]]
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expected = set([(1, 0), (1, 1), (1, 2)])
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self.assertEqual(saddle_points(matrix), expected)
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def test_identify_saddle_point_in_bottom_right_corner(self):
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matrix = [[8, 7, 9], [6, 7, 6], [3, 2, 5]]
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expected = set([(2, 2)])
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self.assertEqual(saddle_points(matrix), expected)
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# Additional tests for this track
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def test_irregular_matrix(self):
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matrix = [[3, 2, 1], [0, 1], [2, 1, 0]]
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with self.assertRaisesWithMessage(ValueError):
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saddle_points(matrix)
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# Utility functions
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def setUp(self):
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try:
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self.assertRaisesRegex
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except AttributeError:
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self.assertRaisesRegex = self.assertRaisesRegexp
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def assertRaisesWithMessage(self, exception):
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return self.assertRaisesRegex(exception, r".+")
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if __name__ == '__main__':
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unittest.main()
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