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e0d88a173c
be implicit. Added a warning for when sys.path_hooks is found to be empty. Also changed the meaning of None in sys.path_importer_cache to represent trying sys.path_hooks again (an interpretation of previous semantics). Also added a warning for when None was found. The long-term goal is for None in sys.path_importer_cache to represent the same as imp.NullImporter: no finder found for that sys.path entry.
116 lines
4.6 KiB
Python
116 lines
4.6 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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import warnings
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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_empty_list(self):
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# An empty list should not count as asking for sys.path.
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module = '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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self.assertIsNone(machinery.PathFinder.find_module('module', []))
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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_empty_path_hooks(self):
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# Test that if sys.path_hooks is empty a warning is raised and
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# PathFinder returns None.
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# tried again (with a warning).
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with util.import_state(path_importer_cache={}, path_hooks=[],
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path=['bogus_path']):
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always')
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self.assertIsNone(machinery.PathFinder.find_module('os'))
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self.assertNotIn('os', sys.path_importer_cache)
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self.assertEqual(len(w), 1)
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self.assertTrue(issubclass(w[-1].category, ImportWarning))
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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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path_hooks=[imp.NullImporter]):
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always')
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loader = machinery.PathFinder.find_module(module)
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self.assertTrue(loader is importer)
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self.assertEqual(len(w), 1)
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warned = w[0]
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self.assertTrue(issubclass(warned.category, ImportWarning))
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self.assertIn(repr(None), str(warned.message))
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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.curdir, 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.curdir, sys.path_importer_cache)
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def test_main():
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from test.support import run_unittest
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run_unittest(FinderTests)
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if __name__ == '__main__':
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test_main()
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