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1from .. import abc
2from .. import util
3
4machinery = util.import_importlib('importlib.machinery')
5
6import sys
7import types
8import unittest
9import warnings
10
11@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
12class LoaderTests(abc.LoaderTests):
13
14    """Test load_module() for built-in modules."""
15
16    def setUp(self):
17        self.verification = {'__name__': 'errno', '__package__': '',
18                             '__loader__': self.machinery.BuiltinImporter}
19
20    def verify(self, module):
21        """Verify that the module matches against what it should have."""
22        self.assertIsInstance(module, types.ModuleType)
23        for attr, value in self.verification.items():
24            self.assertEqual(getattr(module, attr), value)
25        self.assertIn(module.__name__, sys.modules)
26
27    def load_module(self, name):
28        with warnings.catch_warnings():
29            warnings.simplefilter("ignore", DeprecationWarning)
30            return self.machinery.BuiltinImporter.load_module(name)
31
32    def test_module(self):
33        # Common case.
34        with util.uncache(util.BUILTINS.good_name):
35            module = self.load_module(util.BUILTINS.good_name)
36            self.verify(module)
37
38    # Built-in modules cannot be a package.
39    test_package = test_lacking_parent = None
40
41    # No way to force an import failure.
42    test_state_after_failure = None
43
44    def test_module_reuse(self):
45        # Test that the same module is used in a reload.
46        with util.uncache(util.BUILTINS.good_name):
47            module1 = self.load_module(util.BUILTINS.good_name)
48            module2 = self.load_module(util.BUILTINS.good_name)
49            self.assertIs(module1, module2)
50
51    def test_unloadable(self):
52        name = 'dssdsdfff'
53        assert name not in sys.builtin_module_names
54        with self.assertRaises(ImportError) as cm:
55            self.load_module(name)
56        self.assertEqual(cm.exception.name, name)
57
58    def test_already_imported(self):
59        # Using the name of a module already imported but not a built-in should
60        # still fail.
61        module_name = 'builtin_reload_test'
62        assert module_name not in sys.builtin_module_names
63        with util.uncache(module_name):
64            module = types.ModuleType(module_name)
65            sys.modules[module_name] = module
66        with self.assertRaises(ImportError) as cm:
67            self.load_module(module_name)
68        self.assertEqual(cm.exception.name, module_name)
69
70
71(Frozen_LoaderTests,
72 Source_LoaderTests
73 ) = util.test_both(LoaderTests, machinery=machinery)
74
75
76@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
77class InspectLoaderTests:
78
79    """Tests for InspectLoader methods for BuiltinImporter."""
80
81    def test_get_code(self):
82        # There is no code object.
83        result = self.machinery.BuiltinImporter.get_code(util.BUILTINS.good_name)
84        self.assertIsNone(result)
85
86    def test_get_source(self):
87        # There is no source.
88        result = self.machinery.BuiltinImporter.get_source(util.BUILTINS.good_name)
89        self.assertIsNone(result)
90
91    def test_is_package(self):
92        # Cannot be a package.
93        result = self.machinery.BuiltinImporter.is_package(util.BUILTINS.good_name)
94        self.assertFalse(result)
95
96    @unittest.skipIf(util.BUILTINS.bad_name is None, 'all modules are built in')
97    def test_not_builtin(self):
98        # Modules not built-in should raise ImportError.
99        for meth_name in ('get_code', 'get_source', 'is_package'):
100            method = getattr(self.machinery.BuiltinImporter, meth_name)
101        with self.assertRaises(ImportError) as cm:
102            method(util.BUILTINS.bad_name)
103
104
105(Frozen_InspectLoaderTests,
106 Source_InspectLoaderTests
107 ) = util.test_both(InspectLoaderTests, machinery=machinery)
108
109
110if __name__ == '__main__':
111    unittest.main()
112