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from importlib import _bootstrap
from importlib import machinery
from .. import util
from . import util as import_util
import imp
import os
import sys
import tempfile
from test import support
from types import MethodType
import unittest
import warnings
class FinderTests(unittest.TestCase):
"""Tests for PathFinder."""
def test_failure(self):
# Test None returned upon not finding a suitable finder.
module = '<test module>'
with util.import_state():
self.assertTrue(machinery.PathFinder.find_module(module) is None)
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_modules(module)
with util.import_state(path_importer_cache={path: importer},
path=[path]):
loader = machinery.PathFinder.find_module(module)
self.assertTrue(loader is 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_modules(module)
with util.import_state(path_importer_cache={path: importer}):
loader = machinery.PathFinder.find_module(module, [path])
self.assertTrue(loader is 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_modules(module)
with util.import_state(path_importer_cache={path: importer},
path=[path]):
self.assertIsNone(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_modules(module)
hook = import_util.mock_path_hook(path, importer=importer)
with util.import_state(path_hooks=[hook]):
loader = machinery.PathFinder.find_module(module, [path])
self.assertTrue(loader is importer)
self.assertTrue(path in sys.path_importer_cache)
self.assertTrue(sys.path_importer_cache[path] is 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(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_modules(module)
hook = import_util.mock_path_hook(os.curdir, importer=importer)
with util.import_state(path=[path], path_hooks=[hook]):
loader = machinery.PathFinder.find_module(module)
self.assertIs(loader, importer)
self.assertIn(os.curdir, sys.path_importer_cache)
def test_main():
from test.support import run_unittest
run_unittest(FinderTests)
if __name__ == '__main__':
test_main()
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