1from unittest.mock import mock_open, patch
 2import unittest
 3from bangaranga import does_the_banga_rang, TheBangaDoesNotRangError
 4
 5
 6def bang_the_ranga(content):
 7    with patch("builtins.open", mock_open(read_data=content)):
 8        return does_the_banga_rang("any.txt")
 9
10
11class TestDoesTheBangaRang(unittest.TestCase):
12    def banga_the_ranga_ception(self, exception):
13        with patch("builtins.open", side_effect=exception):
14            with self.assertRaises(TheBangaDoesNotRangError):
15                does_the_banga_rang("missing.txt")
16
17    def test_multiple_words_form_bangaranga(self):
18        self.assertEqual(bang_the_ranga("ban ga ran ga"), 4)
19
20    def test_multiple_words_with_noise(self):
21        self.assertEqual(bang_the_ranga("hello i will bang my a small ranga ranga danga"), 3)
22
23    def test_single_word_with_noise(self):
24        self.assertEqual(bang_the_ranga("fangaranga bangaranga dangadanga mangaranga"), 1)
25
26    def test_minimum_word_match(self):
27        self.assertEqual(bang_the_ranga("bang a banga ranga bangaranga"), 1)
28
29    def test_word_parts_in_order(self):
30        self.assertEqual(bang_the_ranga("ga ga ran banga"), 0)
31
32    def test_partial_match(self):
33        self.assertEqual(bang_the_ranga("Does a banga rang?"), 0)
34
35    def test_with_empty_file(self):
36        self.assertEqual(bang_the_ranga(""), 0)
37
38    def test_case_insensitive(self):
39        self.assertEqual(bang_the_ranga("BaNga rANgA"), 2)
40
41    def test_punctuation_splits_words_on_different_separators(self):
42        self.assertEqual(bang_the_ranga("b,a$n!g%a r'a\"n@g;()*&-_=\\|~`a"), 10)
43
44    def test_repeated_words_still_finds_minimum(self):
45        self.assertEqual(bang_the_ranga("banga ranga banga ranga banga ranga banga banga ranga banga"), 2)
46
47    def test_os_error_raises_custom_exception(self):
48        self.banga_the_ranga_ception(OSError)
49
50    def test_io_error_raises_custom_exception(self):
51        self.banga_the_ranga_ception(IOError)
52
53
54if __name__ == "__main__":
55    unittest.main()