1"""Test case-sensitivity (PEP 235)."""
2from .. import util
3
4importlib = util.import_importlib('importlib')
5machinery = util.import_importlib('importlib.machinery')
6
7import os
8from test import support as test_support
9import unittest
10
11
12@util.case_insensitive_tests
13class CaseSensitivityTest(util.CASEOKTestBase):
14
15    """PEP 235 dictates that on case-preserving, case-insensitive file systems
16    that imports are case-sensitive unless the PYTHONCASEOK environment
17    variable is set."""
18
19    name = 'MoDuLe'
20    assert name != name.lower()
21
22    def finder(self, path):
23        return self.machinery.FileFinder(path,
24                                      (self.machinery.SourceFileLoader,
25                                            self.machinery.SOURCE_SUFFIXES),
26                                        (self.machinery.SourcelessFileLoader,
27                                            self.machinery.BYTECODE_SUFFIXES))
28
29    def sensitivity_test(self):
30        """Look for a module with matching and non-matching sensitivity."""
31        sensitive_pkg = 'sensitive.{0}'.format(self.name)
32        insensitive_pkg = 'insensitive.{0}'.format(self.name.lower())
33        context = util.create_modules(insensitive_pkg, sensitive_pkg)
34        with context as mapping:
35            sensitive_path = os.path.join(mapping['.root'], 'sensitive')
36            insensitive_path = os.path.join(mapping['.root'], 'insensitive')
37            sensitive_finder = self.finder(sensitive_path)
38            insensitive_finder = self.finder(insensitive_path)
39            return self.find(sensitive_finder), self.find(insensitive_finder)
40
41    def test_sensitive(self):
42        with test_support.EnvironmentVarGuard() as env:
43            env.unset('PYTHONCASEOK')
44            self.caseok_env_changed(should_exist=False)
45            sensitive, insensitive = self.sensitivity_test()
46            self.assertIsNotNone(sensitive)
47            self.assertIn(self.name, sensitive.get_filename(self.name))
48            self.assertIsNone(insensitive)
49
50    def test_insensitive(self):
51        with test_support.EnvironmentVarGuard() as env:
52            env.set('PYTHONCASEOK', '1')
53            self.caseok_env_changed(should_exist=True)
54            sensitive, insensitive = self.sensitivity_test()
55            self.assertIsNotNone(sensitive)
56            self.assertIn(self.name, sensitive.get_filename(self.name))
57            self.assertIsNotNone(insensitive)
58            self.assertIn(self.name, insensitive.get_filename(self.name))
59
60
61class CaseSensitivityTestPEP302(CaseSensitivityTest):
62    def find(self, finder):
63        return finder.find_module(self.name)
64
65
66(Frozen_CaseSensitivityTestPEP302,
67 Source_CaseSensitivityTestPEP302
68 ) = util.test_both(CaseSensitivityTestPEP302, importlib=importlib,
69                    machinery=machinery)
70
71
72class CaseSensitivityTestPEP451(CaseSensitivityTest):
73    def find(self, finder):
74        found = finder.find_spec(self.name)
75        return found.loader if found is not None else found
76
77
78(Frozen_CaseSensitivityTestPEP451,
79 Source_CaseSensitivityTestPEP451
80 ) = util.test_both(CaseSensitivityTestPEP451, importlib=importlib,
81                    machinery=machinery)
82
83
84if __name__ == '__main__':
85    unittest.main()
86