1import os
 2import tempfile
 3import unittest
 4
 5from bangaranga import does_the_banga_rang, TheBangaDoesNotRangError
 6
 7
 8class TestDoesTheBangaRang(unittest.TestCase):
 9    def make_file(self, content):
10        file = tempfile.NamedTemporaryFile(
11            mode="w",
12            encoding="utf-8",
13            delete=False
14        )
15
16        with file:
17            file.write(content)
18
19        self.addCleanup(lambda: os.path.exists(file.name) and os.remove(file.name))
20        return file.name
21
22    def check_content(self, content, expected):
23        filename = self.make_file(content)
24        self.assertEqual(does_the_banga_rang(filename), expected)
25
26    def test_finds_bangaranga_as_one_whole_word(self):
27        self.check_content("some words before bangaranga and after", 1)
28
29    def test_finds_two_words_in_correct_order(self):
30        self.check_content("The banga is doing some ranga!", 2)
31
32    def test_finds_three_words_with_punctuation_between_them(self):
33        self.check_content("Well... bang, a small ranga appears.", 3)
34
35    def test_returns_minimal_number_of_words_when_multiple_options_exist(self):
36        self.check_content("bang a banga ranga bangaranga", 1)
37
38    def test_is_case_insensitive(self):
39        self.check_content("Something BaNgA something else RaNgA!", 2)
40
41    def test_words_must_be_in_the_correct_order(self):
42        self.check_content("ranga is here before banga", 0)
43
44    def test_does_not_use_parts_inside_bigger_words(self):
45        self.check_content("xxbangaranga bangarangaxx", 0)
46
47    def test_respects_regex_word_boundaries_with_digits_and_underscore(self):
48        self.check_content("bangaranga1 _bangaranga bangaranga_", 0)
49
50    def test_close_but_not_enough_words_returns_zero(self):
51        self.check_content("Does the banga rang?", 0)
52
53    def test_empty_file_returns_zero(self):
54        self.check_content("", 0)
55
56    def test_missing_file_raises_custom_error(self):
57        missing_file = os.path.join(tempfile.gettempdir(), "surely_missing_bangaranga_file.txt")
58
59        if os.path.exists(missing_file):
60            os.remove(missing_file)
61
62        with self.assertRaises(TheBangaDoesNotRangError):
63            does_the_banga_rang(missing_file)
64
65
66if __name__ == "__main__":
67    unittest.main()