142 lines
5.6 KiB
Python
142 lines
5.6 KiB
Python
from importlib import _bootstrap
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from importlib import machinery
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from .. import util
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from . import util as import_util
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import imp
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import os
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import sys
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import tempfile
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from test import support
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from types import MethodType
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import unittest
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class FinderTests(unittest.TestCase):
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"""Tests for PathFinder."""
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def test_failure(self):
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# Test None returned upon not finding a suitable finder.
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module = '<test module>'
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with util.import_state():
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self.assertTrue(machinery.PathFinder.find_module(module) is None)
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def test_sys_path(self):
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# Test that sys.path is used when 'path' is None.
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# Implicitly tests that sys.path_importer_cache is used.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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with util.import_state(path_importer_cache={path: importer},
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path=[path]):
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loader = machinery.PathFinder.find_module(module)
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self.assertTrue(loader is importer)
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def test_path(self):
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# Test that 'path' is used when set.
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# Implicitly tests that sys.path_importer_cache is used.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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with util.import_state(path_importer_cache={path: importer}):
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loader = machinery.PathFinder.find_module(module, [path])
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self.assertTrue(loader is importer)
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def test_path_hooks(self):
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# Test that sys.path_hooks is used.
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# Test that sys.path_importer_cache is set.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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hook = import_util.mock_path_hook(path, importer=importer)
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with util.import_state(path_hooks=[hook]):
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loader = machinery.PathFinder.find_module(module, [path])
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self.assertTrue(loader is importer)
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self.assertTrue(path in sys.path_importer_cache)
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self.assertTrue(sys.path_importer_cache[path] is importer)
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def test_path_importer_cache_has_None(self):
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# Test that if sys.path_importer_cache has None that None is returned.
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clear_cache = {path: None for path in sys.path}
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with util.import_state(path_importer_cache=clear_cache):
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for name in ('asynchat', 'sys', '<test module>'):
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self.assertTrue(machinery.PathFinder.find_module(name) is None)
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def test_path_importer_cache_has_None_continues(self):
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# Test that having None in sys.path_importer_cache causes the search to
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# continue.
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path = '<test path>'
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module = '<test module>'
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importer = util.mock_modules(module)
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with util.import_state(path=['1', '2'],
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path_importer_cache={'1': None, '2': importer}):
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loader = machinery.PathFinder.find_module(module)
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self.assertTrue(loader is importer)
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def test_path_importer_cache_empty_string(self):
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# The empty string should create a finder using the cwd.
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path = ''
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module = '<test module>'
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importer = util.mock_modules(module)
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hook = import_util.mock_path_hook(os.getcwd(), importer=importer)
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with util.import_state(path=[path], path_hooks=[hook]):
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loader = machinery.PathFinder.find_module(module)
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self.assertIs(loader, importer)
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self.assertIn(os.getcwd(), sys.path_importer_cache)
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class DefaultPathFinderTests(unittest.TestCase):
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"""Test importlib._bootstrap._DefaultPathFinder."""
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def test_implicit_hooks(self):
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# Test that the implicit path hooks are used.
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bad_path = '<path>'
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module = '<module>'
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assert not os.path.exists(bad_path)
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existing_path = tempfile.mkdtemp()
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try:
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with util.import_state():
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nothing = _bootstrap._DefaultPathFinder.find_module(module,
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path=[existing_path])
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self.assertTrue(nothing is None)
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self.assertTrue(existing_path in sys.path_importer_cache)
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result = isinstance(sys.path_importer_cache[existing_path],
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imp.NullImporter)
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self.assertFalse(result)
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nothing = _bootstrap._DefaultPathFinder.find_module(module,
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path=[bad_path])
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self.assertTrue(nothing is None)
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self.assertTrue(bad_path in sys.path_importer_cache)
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self.assertTrue(isinstance(sys.path_importer_cache[bad_path],
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imp.NullImporter))
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finally:
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os.rmdir(existing_path)
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def test_path_importer_cache_has_None(self):
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# Test that the default hook is used when sys.path_importer_cache
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# contains None for a path.
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module = '<test module>'
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importer = util.mock_modules(module)
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path = '<test path>'
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# XXX Not blackbox.
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original_hook = _bootstrap._DEFAULT_PATH_HOOK
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mock_hook = import_util.mock_path_hook(path, importer=importer)
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_bootstrap._DEFAULT_PATH_HOOK = mock_hook
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try:
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with util.import_state(path_importer_cache={path: None}):
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loader = _bootstrap._DefaultPathFinder.find_module(module,
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path=[path])
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self.assertTrue(loader is importer)
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finally:
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_bootstrap._DEFAULT_PATH_HOOK = original_hook
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def test_main():
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from test.support import run_unittest
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run_unittest(FinderTests, DefaultPathFinderTests)
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if __name__ == '__main__':
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test_main()
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