mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
f4dc9204cc
state of the import system. Also make importlib.invalidate_caches() work with sys.meta_path instead of sys.path_importer_cache to completely separate the path-based import system from the overall import system. Patch by Eric Snow.
187 lines
7 KiB
Python
187 lines
7 KiB
Python
from . import util
|
|
import imp
|
|
import importlib
|
|
from importlib import machinery
|
|
import sys
|
|
from test import support
|
|
import unittest
|
|
|
|
|
|
class ImportModuleTests(unittest.TestCase):
|
|
|
|
"""Test importlib.import_module."""
|
|
|
|
def test_module_import(self):
|
|
# Test importing a top-level module.
|
|
with util.mock_modules('top_level') as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
module = importlib.import_module('top_level')
|
|
self.assertEqual(module.__name__, 'top_level')
|
|
|
|
def test_absolute_package_import(self):
|
|
# Test importing a module from a package with an absolute name.
|
|
pkg_name = 'pkg'
|
|
pkg_long_name = '{0}.__init__'.format(pkg_name)
|
|
name = '{0}.mod'.format(pkg_name)
|
|
with util.mock_modules(pkg_long_name, name) as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
module = importlib.import_module(name)
|
|
self.assertEqual(module.__name__, name)
|
|
|
|
def test_shallow_relative_package_import(self):
|
|
# Test importing a module from a package through a relative import.
|
|
pkg_name = 'pkg'
|
|
pkg_long_name = '{0}.__init__'.format(pkg_name)
|
|
module_name = 'mod'
|
|
absolute_name = '{0}.{1}'.format(pkg_name, module_name)
|
|
relative_name = '.{0}'.format(module_name)
|
|
with util.mock_modules(pkg_long_name, absolute_name) as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
importlib.import_module(pkg_name)
|
|
module = importlib.import_module(relative_name, pkg_name)
|
|
self.assertEqual(module.__name__, absolute_name)
|
|
|
|
def test_deep_relative_package_import(self):
|
|
modules = ['a.__init__', 'a.b.__init__', 'a.c']
|
|
with util.mock_modules(*modules) as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
importlib.import_module('a')
|
|
importlib.import_module('a.b')
|
|
module = importlib.import_module('..c', 'a.b')
|
|
self.assertEqual(module.__name__, 'a.c')
|
|
|
|
def test_absolute_import_with_package(self):
|
|
# Test importing a module from a package with an absolute name with
|
|
# the 'package' argument given.
|
|
pkg_name = 'pkg'
|
|
pkg_long_name = '{0}.__init__'.format(pkg_name)
|
|
name = '{0}.mod'.format(pkg_name)
|
|
with util.mock_modules(pkg_long_name, name) as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
importlib.import_module(pkg_name)
|
|
module = importlib.import_module(name, pkg_name)
|
|
self.assertEqual(module.__name__, name)
|
|
|
|
def test_relative_import_wo_package(self):
|
|
# Relative imports cannot happen without the 'package' argument being
|
|
# set.
|
|
with self.assertRaises(TypeError):
|
|
importlib.import_module('.support')
|
|
|
|
|
|
def test_loaded_once(self):
|
|
# Issue #13591: Modules should only be loaded once when
|
|
# initializing the parent package attempts to import the
|
|
# module currently being imported.
|
|
b_load_count = 0
|
|
def load_a():
|
|
importlib.import_module('a.b')
|
|
def load_b():
|
|
nonlocal b_load_count
|
|
b_load_count += 1
|
|
code = {'a': load_a, 'a.b': load_b}
|
|
modules = ['a.__init__', 'a.b']
|
|
with util.mock_modules(*modules, module_code=code) as mock:
|
|
with util.import_state(meta_path=[mock]):
|
|
importlib.import_module('a.b')
|
|
self.assertEqual(b_load_count, 1)
|
|
|
|
|
|
class FindLoaderTests(unittest.TestCase):
|
|
|
|
class FakeMetaFinder:
|
|
@staticmethod
|
|
def find_module(name, path=None): return name, path
|
|
|
|
def test_sys_modules(self):
|
|
# If a module with __loader__ is in sys.modules, then return it.
|
|
name = 'some_mod'
|
|
with util.uncache(name):
|
|
module = imp.new_module(name)
|
|
loader = 'a loader!'
|
|
module.__loader__ = loader
|
|
sys.modules[name] = module
|
|
found = importlib.find_loader(name)
|
|
self.assertEqual(loader, found)
|
|
|
|
def test_sys_modules_loader_is_None(self):
|
|
# If sys.modules[name].__loader__ is None, raise ValueError.
|
|
name = 'some_mod'
|
|
with util.uncache(name):
|
|
module = imp.new_module(name)
|
|
module.__loader__ = None
|
|
sys.modules[name] = module
|
|
with self.assertRaises(ValueError):
|
|
importlib.find_loader(name)
|
|
|
|
def test_success(self):
|
|
# Return the loader found on sys.meta_path.
|
|
name = 'some_mod'
|
|
with util.uncache(name):
|
|
with util.import_state(meta_path=[self.FakeMetaFinder]):
|
|
self.assertEqual((name, None), importlib.find_loader(name))
|
|
|
|
def test_success_path(self):
|
|
# Searching on a path should work.
|
|
name = 'some_mod'
|
|
path = 'path to some place'
|
|
with util.uncache(name):
|
|
with util.import_state(meta_path=[self.FakeMetaFinder]):
|
|
self.assertEqual((name, path),
|
|
importlib.find_loader(name, path))
|
|
|
|
def test_nothing(self):
|
|
# None is returned upon failure to find a loader.
|
|
self.assertIsNone(importlib.find_loader('nevergoingtofindthismodule'))
|
|
|
|
|
|
class InvalidateCacheTests(unittest.TestCase):
|
|
|
|
def test_method_called(self):
|
|
# If defined the method should be called.
|
|
class InvalidatingNullFinder:
|
|
def __init__(self, *ignored):
|
|
self.called = False
|
|
def find_module(self, *args):
|
|
return None
|
|
def invalidate_caches(self):
|
|
self.called = True
|
|
|
|
key = 'gobledeegook'
|
|
meta_ins = InvalidatingNullFinder()
|
|
path_ins = InvalidatingNullFinder()
|
|
sys.meta_path.insert(0, meta_ins)
|
|
self.addCleanup(lambda: sys.path_importer_cache.__delitem__(key))
|
|
sys.path_importer_cache[key] = path_ins
|
|
self.addCleanup(lambda: sys.meta_path.remove(meta_ins))
|
|
importlib.invalidate_caches()
|
|
self.assertTrue(meta_ins.called)
|
|
self.assertTrue(path_ins.called)
|
|
|
|
def test_method_lacking(self):
|
|
# There should be no issues if the method is not defined.
|
|
key = 'gobbledeegook'
|
|
sys.path_importer_cache[key] = imp.NullImporter('abc')
|
|
self.addCleanup(lambda: sys.path_importer_cache.__delitem__(key))
|
|
importlib.invalidate_caches() # Shouldn't trigger an exception.
|
|
|
|
|
|
class FrozenImportlibTests(unittest.TestCase):
|
|
|
|
def test_no_frozen_importlib(self):
|
|
# Should be able to import w/o _frozen_importlib being defined.
|
|
module = support.import_fresh_module('importlib', blocked=['_frozen_importlib'])
|
|
self.assertFalse(isinstance(module.__loader__,
|
|
machinery.FrozenImporter))
|
|
|
|
|
|
def test_main():
|
|
from test.support import run_unittest
|
|
run_unittest(ImportModuleTests,
|
|
FindLoaderTests,
|
|
InvalidateCacheTests,
|
|
FrozenImportlibTests)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|