1import os
 2import tempfile
 3import unittest
 4
 5from bangaranga import does_the_banga_rang, TheBangaDoesNotRangError
 6
 7
 8class TestDoesTheBangaRang(unittest.TestCase):
 9    def create_file(self, content):
10        temp_dir = tempfile.TemporaryDirectory()
11        self.addCleanup(temp_dir.cleanup)
12
13        path = os.path.join(temp_dir.name, "input.txt")
14
15        with open(path, "w", encoding="utf-8") as file:
16            file.write(content)
17
18        return path
19
20    def test_returns_one_when_bangaranga_is_single_word(self):
21        path = self.create_file("This file contains bangaranga inside.")
22
23        self.assertEqual(1, does_the_banga_rang(path))
24
25    def test_returns_two_when_banga_and_ranga_form_bangaranga(self):
26        path = self.create_file("The banga is doing some ranga!")
27
28        self.assertEqual(2, does_the_banga_rang(path))
29
30    def test_returns_three_when_bang_a_ranga_form_bangaranga(self):
31        path = self.create_file("bang a small ranga")
32
33        self.assertEqual(3, does_the_banga_rang(path))
34
35    def test_returns_minimum_number_of_words_when_multiple_solutions_exist(self):
36        path = self.create_file("bang a banga ranga bangaranga")
37
38        self.assertEqual(1, does_the_banga_rang(path))
39
40    def test_is_case_insensitive(self):
41        path = self.create_file("BANG A RANGA")
42
43        self.assertEqual(3, does_the_banga_rang(path))
44
45    def test_words_may_be_separated_by_punctuation(self):
46        path = self.create_file("Well... banga, finally: ranga!")
47
48        self.assertEqual(2, does_the_banga_rang(path))
49
50    def test_returns_zero_when_words_are_in_wrong_order(self):
51        path = self.create_file("ranga is before banga")
52
53        self.assertEqual(0, does_the_banga_rang(path))
54
55    def test_returns_zero_when_concatenation_does_not_match_exactly(self):
56        path = self.create_file("Does the banga rang?")
57
58        self.assertEqual(0, does_the_banga_rang(path))
59
60    def test_returns_zero_when_matching_parts_are_not_whole_words(self):
61        path = self.create_file("xxbanga ranga bangarangaxx")
62
63        self.assertEqual(0, does_the_banga_rang(path))
64
65    def test_raises_custom_error_when_file_cannot_be_read(self):
66        missing_path = os.path.join("directory_that_should_not_exist", "missing.txt")
67
68        with self.assertRaises(TheBangaDoesNotRangError):
69            does_the_banga_rang(missing_path)
70
71
72if __name__ == "__main__":
73    unittest.main()