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from .. 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."""
def test_failure(self):
# Test None returned upon not finding a suitable loader.
module = '<test module>'
with util.import_state():
self.assertIsNone(self.machinery.PathFinder.find_module(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]):
loader = self.machinery.PathFinder.find_module(module)
self.assertIs(loader, 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}):
loader = self.machinery.PathFinder.find_module(module, [path])
self.assertIs(loader, 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.machinery.PathFinder.find_module('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]):
loader = self.machinery.PathFinder.find_module(module, [path])
self.assertIs(loader, 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')
self.assertIsNone(self.machinery.PathFinder.find_module('os'))
self.assertIsNone(sys.path_importer_cache[path_entry])
self.assertEqual(len(w), 1)
self.assertTrue(issubclass(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]):
loader = self.machinery.PathFinder.find_module(module)
self.assertIs(loader, 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_module(self):
class TestFinder:
def find_module(self, fullname):
return self.to_return
failing_finder = TestFinder()
failing_finder.to_return = None
path = 'testing path'
with util.import_state(path_importer_cache={path: failing_finder}):
self.assertIsNone(
self.machinery.PathFinder.find_spec('whatever', [path]))
success_finder = TestFinder()
success_finder.to_return = __loader__
with util.import_state(path_importer_cache={path: success_finder}):
spec = self.machinery.PathFinder.find_spec('whatever', [path])
self.assertEqual(spec.loader, __loader__)
def test_finder_with_find_loader(self):
class TestFinder:
loader = None
portions = []
def find_loader(self, fullname):
return self.loader, self.portions
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.loader = __loader__
with util.import_state(path_importer_cache={path: success_finder}):
spec = self.machinery.PathFinder.find_spec('whatever', [path])
self.assertEqual(spec.loader, __loader__)
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'))
(Frozen_FinderTests,
Source_FinderTests
) = util.test_both(FinderTests, importlib=importlib, machinery=machinery)
class PathEntryFinderTests:
def test_finder_with_failing_find_module(self):
# PathEntryFinder with find_module() defined should work.
# Issue #20763.
class Finder:
path_location = 'test_finder_with_find_module'
def __init__(self, path):
if path != self.path_location:
raise ImportError
@staticmethod
def find_module(fullname):
return None
with util.import_state(path=[Finder.path_location]+sys.path[:],
path_hooks=[Finder]):
self.machinery.PathFinder.find_spec('importlib')
(Frozen_PEFTests,
Source_PEFTests
) = util.test_both(PathEntryFinderTests, machinery=machinery)
if __name__ == '__main__':
unittest.main()
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