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"""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()
Version data entries
52 entries across 52 versions & 1 rubygems