| 1 | n/a | """Test that the semantics relating to the 'fromlist' argument are correct.""" |
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| 2 | n/a | from .. import util |
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| 3 | n/a | from . import util as import_util |
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| 4 | n/a | import imp |
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| 5 | n/a | import unittest |
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| 6 | n/a | |
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| 7 | n/a | class ReturnValue(unittest.TestCase): |
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| 8 | n/a | |
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| 9 | n/a | """The use of fromlist influences what import returns. |
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| 10 | n/a | |
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| 11 | n/a | If direct ``import ...`` statement is used, the root module or package is |
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| 12 | n/a | returned [import return]. But if fromlist is set, then the specified module |
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| 13 | n/a | is actually returned (whether it is a relative import or not) |
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| 14 | n/a | [from return]. |
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| 15 | n/a | |
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| 16 | n/a | """ |
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| 17 | n/a | |
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| 18 | n/a | def test_return_from_import(self): |
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| 19 | n/a | # [import return] |
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| 20 | n/a | with util.mock_modules('pkg.__init__', 'pkg.module') as importer: |
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| 21 | n/a | with util.import_state(meta_path=[importer]): |
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| 22 | n/a | module = import_util.import_('pkg.module') |
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| 23 | n/a | self.assertEqual(module.__name__, 'pkg') |
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| 24 | n/a | |
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| 25 | n/a | def test_return_from_from_import(self): |
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| 26 | n/a | # [from return] |
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| 27 | n/a | with util.mock_modules('pkg.__init__', 'pkg.module')as importer: |
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| 28 | n/a | with util.import_state(meta_path=[importer]): |
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| 29 | n/a | module = import_util.import_('pkg.module', fromlist=['attr']) |
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| 30 | n/a | self.assertEqual(module.__name__, 'pkg.module') |
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| 31 | n/a | |
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| 32 | n/a | |
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| 33 | n/a | class HandlingFromlist(unittest.TestCase): |
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| 34 | n/a | |
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| 35 | n/a | """Using fromlist triggers different actions based on what is being asked |
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| 36 | n/a | of it. |
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| 37 | n/a | |
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| 38 | n/a | If fromlist specifies an object on a module, nothing special happens |
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| 39 | n/a | [object case]. This is even true if the object does not exist [bad object]. |
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| 40 | n/a | |
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| 41 | n/a | If a package is being imported, then what is listed in fromlist may be |
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| 42 | n/a | treated as a module to be imported [module]. And this extends to what is |
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| 43 | n/a | contained in __all__ when '*' is imported [using *]. And '*' does not need |
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| 44 | n/a | to be the only name in the fromlist [using * with others]. |
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| 45 | n/a | |
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| 46 | n/a | """ |
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| 47 | n/a | |
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| 48 | n/a | def test_object(self): |
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| 49 | n/a | # [object case] |
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| 50 | n/a | with util.mock_modules('module') as importer: |
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| 51 | n/a | with util.import_state(meta_path=[importer]): |
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| 52 | n/a | module = import_util.import_('module', fromlist=['attr']) |
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| 53 | n/a | self.assertEqual(module.__name__, 'module') |
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| 54 | n/a | |
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| 55 | n/a | def test_unexistent_object(self): |
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| 56 | n/a | # [bad object] |
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| 57 | n/a | with util.mock_modules('module') as importer: |
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| 58 | n/a | with util.import_state(meta_path=[importer]): |
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| 59 | n/a | module = import_util.import_('module', fromlist=['non_existent']) |
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| 60 | n/a | self.assertEqual(module.__name__, 'module') |
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| 61 | n/a | self.assertTrue(not hasattr(module, 'non_existent')) |
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| 62 | n/a | |
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| 63 | n/a | def test_module_from_package(self): |
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| 64 | n/a | # [module] |
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| 65 | n/a | with util.mock_modules('pkg.__init__', 'pkg.module') as importer: |
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| 66 | n/a | with util.import_state(meta_path=[importer]): |
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| 67 | n/a | module = import_util.import_('pkg', fromlist=['module']) |
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| 68 | n/a | self.assertEqual(module.__name__, 'pkg') |
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| 69 | n/a | self.assertTrue(hasattr(module, 'module')) |
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| 70 | n/a | self.assertEqual(module.module.__name__, 'pkg.module') |
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| 71 | n/a | |
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| 72 | n/a | def test_empty_string(self): |
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| 73 | n/a | with util.mock_modules('pkg.__init__', 'pkg.mod') as importer: |
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| 74 | n/a | with util.import_state(meta_path=[importer]): |
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| 75 | n/a | module = import_util.import_('pkg.mod', fromlist=['']) |
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| 76 | n/a | self.assertEqual(module.__name__, 'pkg.mod') |
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| 77 | n/a | |
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| 78 | n/a | def basic_star_test(self, fromlist=['*']): |
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| 79 | n/a | # [using *] |
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| 80 | n/a | with util.mock_modules('pkg.__init__', 'pkg.module') as mock: |
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| 81 | n/a | with util.import_state(meta_path=[mock]): |
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| 82 | n/a | mock['pkg'].__all__ = ['module'] |
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| 83 | n/a | module = import_util.import_('pkg', fromlist=fromlist) |
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| 84 | n/a | self.assertEqual(module.__name__, 'pkg') |
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| 85 | n/a | self.assertTrue(hasattr(module, 'module')) |
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| 86 | n/a | self.assertEqual(module.module.__name__, 'pkg.module') |
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| 87 | n/a | |
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| 88 | n/a | def test_using_star(self): |
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| 89 | n/a | # [using *] |
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| 90 | n/a | self.basic_star_test() |
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| 91 | n/a | |
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| 92 | n/a | def test_fromlist_as_tuple(self): |
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| 93 | n/a | self.basic_star_test(('*',)) |
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| 94 | n/a | |
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| 95 | n/a | def test_star_with_others(self): |
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| 96 | n/a | # [using * with others] |
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| 97 | n/a | context = util.mock_modules('pkg.__init__', 'pkg.module1', 'pkg.module2') |
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| 98 | n/a | with context as mock: |
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| 99 | n/a | with util.import_state(meta_path=[mock]): |
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| 100 | n/a | mock['pkg'].__all__ = ['module1'] |
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| 101 | n/a | module = import_util.import_('pkg', fromlist=['module2', '*']) |
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| 102 | n/a | self.assertEqual(module.__name__, 'pkg') |
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| 103 | n/a | self.assertTrue(hasattr(module, 'module1')) |
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| 104 | n/a | self.assertTrue(hasattr(module, 'module2')) |
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| 105 | n/a | self.assertEqual(module.module1.__name__, 'pkg.module1') |
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| 106 | n/a | self.assertEqual(module.module2.__name__, 'pkg.module2') |
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| 107 | n/a | |
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| 108 | n/a | |
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| 109 | n/a | def test_main(): |
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| 110 | n/a | from test.support import run_unittest |
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| 111 | n/a | run_unittest(ReturnValue, HandlingFromlist) |
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| 112 | n/a | |
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| 113 | n/a | if __name__ == '__main__': |
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| 114 | n/a | test_main() |
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