1from unittest.mock import patch, mock_open
 2from bangaranga import does_the_banga_rang, TheBangaDoesNotRangError
 3import unittest
 4
 5class TestBangaranga(unittest.TestCase):
 6
 7    def setUp(self):
 8        self.filename = "coolfile.txt"
 9
10    def tearDown(self):
11        pass
12
13    def test_bang_the_ranga_normal_string(self):
14        with patch("builtins.open", mock_open(read_data="banga the ranga")):
15            result = does_the_banga_rang(self.filename)
16            self.assertEqual(result, 2)
17
18    def test_bang_the_ranga_random__character_case(self):
19        with patch("builtins.open", mock_open(read_data="bANG A the RAnga")):
20            result = does_the_banga_rang(self.filename)
21            self.assertEqual(result, 3)
22
23    def test_bang_the_ranga_does_find_shortest_case(self):
24        with patch("builtins.open", mock_open(read_data="bang a banga ranga bangaranga")):
25            result = does_the_banga_rang(self.filename)
26            self.assertEqual(result, 1)
27
28    def test_bang_the_ranga_reversed(self):
29        with patch("builtins.open", mock_open(read_data="ranga the banga")):
30            result = does_the_banga_rang(self.filename)
31            self.assertEqual(result, 0)
32
33    def test_bang_the_ranga_no_bangaranga(self):
34        with patch("builtins.open", mock_open(read_data="What an interesting string carrying very useful information")):
35            result = does_the_banga_rang(self.filename)
36            self.assertEqual(result, 0)
37
38    def test_bang_the_ranga_bangaranga_but_part_of_other_words(self):
39        with patch("builtins.open", mock_open(read_data="bangaran garanga")):
40            result = does_the_banga_rang(self.filename)
41            self.assertEqual(result, 0)
42
43    def test_bang_the_ranga_OSError(self):
44        with patch("builtins.open") as mock_file:
45            mock_file.side_effect = OSError("An unfortunate thing to happen")
46
47            with self.assertRaises(TheBangaDoesNotRangError):
48                does_the_banga_rang(self.filename)
49
50    def test_bang_the_ranga_IOError(self):
51        with patch("builtins.open") as mock_file:
52            mock_file.side_effect = IOError(":(")
53
54            with self.assertRaises(TheBangaDoesNotRangError):
55                does_the_banga_rang(self.filename)
56
57if __name__ == "__main__":
58    unittest.main()