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1from test.test_importlib import abc, util
2
3machinery = util.import_importlib('importlib.machinery')
4
5import sys
6import types
7import unittest
8import warnings
9
10@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
11class LoaderTests(abc.LoaderTests):
12
13    """Test load_module() for built-in modules."""
14
15    def setUp(self):
16        self.verification = {'__name__': 'errno', '__package__': '',
17                             '__loader__': self.machinery.BuiltinImporter}
18
19    def verify(self, module):
20        """Verify that the module matches against what it should have."""
21        self.assertIsInstance(module, types.ModuleType)
22        for attr, value in self.verification.items():
23            self.assertEqual(getattr(module, attr), value)
24        self.assertIn(module.__name__, sys.modules)
25
26    def load_module(self, name):
27        with warnings.catch_warnings():
28            warnings.simplefilter("ignore", DeprecationWarning)
29            return self.machinery.BuiltinImporter.load_module(name)
30
31    def test_module(self):
32        # Common case.
33        with util.uncache(util.BUILTINS.good_name):
34            module = self.load_module(util.BUILTINS.good_name)
35            self.verify(module)
36
37    # Built-in modules cannot be a package.
38    test_package = test_lacking_parent = None
39
40    # No way to force an import failure.
41    test_state_after_failure = None
42
43    def test_module_reuse(self):
44        # Test that the same module is used in a reload.
45        with util.uncache(util.BUILTINS.good_name):
46            module1 = self.load_module(util.BUILTINS.good_name)
47            module2 = self.load_module(util.BUILTINS.good_name)
48            self.assertIs(module1, module2)
49
50    def test_unloadable(self):
51        name = 'dssdsdfff'
52        assert name not in sys.builtin_module_names
53        with self.assertRaises(ImportError) as cm:
54            self.load_module(name)
55        self.assertEqual(cm.exception.name, name)
56
57    def test_already_imported(self):
58        # Using the name of a module already imported but not a built-in should
59        # still fail.
60        module_name = 'builtin_reload_test'
61        assert module_name not in sys.builtin_module_names
62        with util.uncache(module_name):
63            module = types.ModuleType(module_name)
64            sys.modules[module_name] = module
65        with self.assertRaises(ImportError) as cm:
66            self.load_module(module_name)
67        self.assertEqual(cm.exception.name, module_name)
68
69
70(Frozen_LoaderTests,
71 Source_LoaderTests
72 ) = util.test_both(LoaderTests, machinery=machinery)
73
74
75@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
76class InspectLoaderTests:
77
78    """Tests for InspectLoader methods for BuiltinImporter."""
79
80    def test_get_code(self):
81        # There is no code object.
82        result = self.machinery.BuiltinImporter.get_code(util.BUILTINS.good_name)
83        self.assertIsNone(result)
84
85    def test_get_source(self):
86        # There is no source.
87        result = self.machinery.BuiltinImporter.get_source(util.BUILTINS.good_name)
88        self.assertIsNone(result)
89
90    def test_is_package(self):
91        # Cannot be a package.
92        result = self.machinery.BuiltinImporter.is_package(util.BUILTINS.good_name)
93        self.assertFalse(result)
94
95    @unittest.skipIf(util.BUILTINS.bad_name is None, 'all modules are built in')
96    def test_not_builtin(self):
97        # Modules not built-in should raise ImportError.
98        for meth_name in ('get_code', 'get_source', 'is_package'):
99            method = getattr(self.machinery.BuiltinImporter, meth_name)
100        with self.assertRaises(ImportError) as cm:
101            method(util.BUILTINS.bad_name)
102
103
104(Frozen_InspectLoaderTests,
105 Source_InspectLoaderTests
106 ) = util.test_both(InspectLoaderTests, machinery=machinery)
107
108
109if __name__ == '__main__':
110    unittest.main()
111