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118 lines
3.7 KiB
Python
118 lines
3.7 KiB
Python
from importlib import util
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from . import util as test_util
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import imp
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import sys
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import types
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import unittest
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class ModuleForLoaderTests(unittest.TestCase):
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"""Tests for importlib.util.module_for_loader."""
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def return_module(self, name):
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fxn = util.module_for_loader(lambda self, module: module)
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return fxn(self, name)
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def raise_exception(self, name):
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def to_wrap(self, module):
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raise ImportError
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fxn = util.module_for_loader(to_wrap)
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try:
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fxn(self, name)
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except ImportError:
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pass
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def test_new_module(self):
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# Test that when no module exists in sys.modules a new module is
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# created.
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module_name = 'a.b.c'
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with test_util.uncache(module_name):
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module = self.return_module(module_name)
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self.assertTrue(module_name in sys.modules)
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self.assertTrue(isinstance(module, types.ModuleType))
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self.assertEqual(module.__name__, module_name)
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def test_reload(self):
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# Test that a module is reused if already in sys.modules.
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name = 'a.b.c'
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module = imp.new_module('a.b.c')
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with test_util.uncache(name):
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sys.modules[name] = module
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returned_module = self.return_module(name)
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self.assertIs(returned_module, sys.modules[name])
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def test_new_module_failure(self):
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# Test that a module is removed from sys.modules if added but an
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# exception is raised.
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name = 'a.b.c'
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with test_util.uncache(name):
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self.raise_exception(name)
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self.assertTrue(name not in sys.modules)
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def test_reload_failure(self):
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# Test that a failure on reload leaves the module in-place.
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name = 'a.b.c'
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module = imp.new_module(name)
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with test_util.uncache(name):
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sys.modules[name] = module
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self.raise_exception(name)
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self.assertIs(module, sys.modules[name])
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class SetPackageTests(unittest.TestCase):
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"""Tests for importlib.util.set_package."""
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def verify(self, module, expect):
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"""Verify the module has the expected value for __package__ after
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passing through set_package."""
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fxn = lambda: module
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wrapped = util.set_package(fxn)
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wrapped()
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self.assertTrue(hasattr(module, '__package__'))
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self.assertEqual(expect, module.__package__)
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def test_top_level(self):
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# __package__ should be set to the empty string if a top-level module.
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# Implicitly tests when package is set to None.
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module = imp.new_module('module')
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module.__package__ = None
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self.verify(module, '')
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def test_package(self):
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# Test setting __package__ for a package.
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module = imp.new_module('pkg')
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module.__path__ = ['<path>']
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module.__package__ = None
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self.verify(module, 'pkg')
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def test_submodule(self):
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# Test __package__ for a module in a package.
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module = imp.new_module('pkg.mod')
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module.__package__ = None
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self.verify(module, 'pkg')
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def test_setting_if_missing(self):
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# __package__ should be set if it is missing.
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module = imp.new_module('mod')
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if hasattr(module, '__package__'):
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delattr(module, '__package__')
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self.verify(module, '')
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def test_leaving_alone(self):
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# If __package__ is set and not None then leave it alone.
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for value in (True, False):
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module = imp.new_module('mod')
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module.__package__ = value
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self.verify(module, value)
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def test_main():
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from test import support
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support.run_unittest(ModuleForLoaderTests, SetPackageTests)
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if __name__ == '__main__':
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test_main()
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