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from test.test_importlib import util
importlib = util.import_importlib('importlib')
machinery = util.import_importlib('importlib.machinery')
import os
import sys
import tempfile
from types import ModuleType
import unittest
import warnings
import zipimport
class FinderTests:
"""Tests for PathFinder."""
find = None
check_found = None
def test_failure(self):
# Test None returned upon not finding a suitable loader.
module = '<test module>'
with util.import_state():
self.assertIsNone(self.find(module))
def test_sys_path(self):
# Test that sys.path is used when 'path' is None.
# Implicitly tests that sys.path_importer_cache is used.
module = '<test module>'
path = '<test path>'
importer = util.mock_spec(module)
with util.import_state(path_importer_cache={path: importer},
path=[path]):
found = self.find(module)
self.check_found(found, importer)
def test_path(self):
# Test that 'path' is used when set.
# Implicitly tests that sys.path_importer_cache is used.
module = '<test module>'
path = '<test path>'
importer = util.mock_spec(module)
with util.import_state(path_importer_cache={path: importer}):
found = self.find(module, [path])
self.check_found(found, importer)
def test_empty_list(self):
# An empty list should not count as asking for sys.path.
module = 'module'
path = '<test path>'
importer = util.mock_spec(module)
with util.import_state(path_importer_cache={path: importer},
path=[path]):
self.assertIsNone(self.find('module', []))
def test_path_hooks(self):
# Test that sys.path_hooks is used.
# Test that sys.path_importer_cache is set.
module = '<test module>'
path = '<test path>'
importer = util.mock_spec(module)
hook = util.mock_path_hook(path, importer=importer)
with util.import_state(path_hooks=[hook]):
found = self.find(module, [path])
self.check_found(found, importer)
self.assertIn(path, sys.path_importer_cache)
self.assertIs(sys.path_importer_cache[path], importer)
def test_empty_path_hooks(self):
# Test that if sys.path_hooks is empty a warning is raised,
# sys.path_importer_cache gets None set, and PathFinder returns None.
path_entry = 'bogus_path'
with util.import_state(path_importer_cache={}, path_hooks=[],
path=[path_entry]):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', ImportWarning)
warnings.simplefilter('ignore', DeprecationWarning)
self.assertIsNone(self.find('os'))
self.assertIsNone(sys.path_importer_cache[path_entry])
self.assertEqual(len(w), 1)
self.assertIsSubclass(w[-1].category, ImportWarning)
def test_path_importer_cache_empty_string(self):
# The empty string should create a finder using the cwd.
path = ''
module = '<test module>'
importer = util.mock_spec(module)
hook = util.mock_path_hook(os.getcwd(), importer=importer)
with util.import_state(path=[path], path_hooks=[hook]):
found = self.find(module)
self.check_found(found, importer)
self.assertIn(os.getcwd(), sys.path_importer_cache)
def test_None_on_sys_path(self):
# Putting None in sys.path[0] caused an import regression from Python
# 3.2: http://bugs.python.org/issue16514
new_path = sys.path[:]
new_path.insert(0, None)
new_path_importer_cache = sys.path_importer_cache.copy()
new_path_importer_cache.pop(None, None)
new_path_hooks = [zipimport.zipimporter,
self.machinery.FileFinder.path_hook(
*self.importlib._bootstrap_external._get_supported_file_loaders())]
missing = object()
email = sys.modules.pop('email', missing)
try:
with util.import_state(meta_path=sys.meta_path[:],
path=new_path,
path_importer_cache=new_path_importer_cache,
path_hooks=new_path_hooks):
module = self.importlib.import_module('email')
self.assertIsInstance(module, ModuleType)
finally:
if email is not missing:
sys.modules['email'] = email
def test_finder_with_find_spec(self):
class TestFinder:
spec = None
def find_spec(self, fullname, target=None):
return self.spec
path = 'testing path'
with util.import_state(path_importer_cache={path: TestFinder()}):
self.assertIsNone(
self.machinery.PathFinder.find_spec('whatever', [path]))
success_finder = TestFinder()
success_finder.spec = self.machinery.ModuleSpec('whatever', __loader__)
with util.import_state(path_importer_cache={path: success_finder}):
got = self.machinery.PathFinder.find_spec('whatever', [path])
self.assertEqual(got, success_finder.spec)
def test_deleted_cwd(self):
# Issue #22834
old_dir = os.getcwd()
self.addCleanup(os.chdir, old_dir)
new_dir = tempfile.mkdtemp()
try:
os.chdir(new_dir)
try:
os.rmdir(new_dir)
except OSError:
# EINVAL on Solaris, EBUSY on AIX, ENOTEMPTY on Windows
self.skipTest("platform does not allow "
"the deletion of the cwd")
except:
os.chdir(old_dir)
os.rmdir(new_dir)
raise
with util.import_state(path=['']):
# Do not want FileNotFoundError raised.
self.assertIsNone(self.machinery.PathFinder.find_spec('whatever'))
def test_invalidate_caches_finders(self):
# Finders with an invalidate_caches() method have it called.
class FakeFinder:
def __init__(self):
self.called = False
def invalidate_caches(self):
self.called = True
key = os.path.abspath('finder_to_invalidate')
cache = {'leave_alone': object(), key: FakeFinder()}
with util.import_state(path_importer_cache=cache):
self.machinery.PathFinder.invalidate_caches()
self.assertTrue(cache[key].called)
def test_invalidate_caches_clear_out_None(self):
# Clear out None in sys.path_importer_cache() when invalidating caches.
cache = {'clear_out': None}
with util.import_state(path_importer_cache=cache):
self.machinery.PathFinder.invalidate_caches()
self.assertEqual(len(cache), 0)
def test_invalidate_caches_clear_out_relative_path(self):
class FakeFinder:
def invalidate_caches(self):
pass
cache = {'relative_path': FakeFinder()}
with util.import_state(path_importer_cache=cache):
self.machinery.PathFinder.invalidate_caches()
self.assertEqual(cache, {})
class FindModuleTests(FinderTests):
def find(self, *args, **kwargs):
spec = self.machinery.PathFinder.find_spec(*args, **kwargs)
return None if spec is None else spec.loader
def check_found(self, found, importer):
self.assertIs(found, importer)
(Frozen_FindModuleTests,
Source_FindModuleTests
) = util.test_both(FindModuleTests, importlib=importlib, machinery=machinery)
class FindSpecTests(FinderTests):
def find(self, *args, **kwargs):
return self.machinery.PathFinder.find_spec(*args, **kwargs)
def check_found(self, found, importer):
self.assertIs(found.loader, importer)
(Frozen_FindSpecTests,
Source_FindSpecTests
) = util.test_both(FindSpecTests, importlib=importlib, machinery=machinery)
class PathEntryFinderTests:
def test_finder_with_failing_find_spec(self):
class Finder:
path_location = 'test_finder_with_find_spec'
def __init__(self, path):
if path != self.path_location:
raise ImportError
@staticmethod
def find_spec(fullname, target=None):
return None
with util.import_state(path=[Finder.path_location]+sys.path[:],
path_hooks=[Finder]):
with warnings.catch_warnings():
warnings.simplefilter("ignore", ImportWarning)
self.machinery.PathFinder.find_spec('importlib')
(Frozen_PEFTests,
Source_PEFTests
) = util.test_both(PathEntryFinderTests, machinery=machinery)
if __name__ == '__main__':
unittest.main()
|
