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from . import util as test_util
init = test_util.import_importlib('importlib')
util = test_util.import_importlib('importlib.util')
machinery = test_util.import_importlib('importlib.machinery')
import os.path
import sys
from test import support
import types
import unittest
import warnings
class ImportModuleTests:
"""Test importlib.import_module."""
def test_module_import(self):
# Test importing a top-level module.
with test_util.mock_modules('top_level') as mock:
with test_util.import_state(meta_path=[mock]):
module = self.init.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 test_util.mock_modules(pkg_long_name, name) as mock:
with test_util.import_state(meta_path=[mock]):
module = self.init.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 test_util.mock_modules(pkg_long_name, absolute_name) as mock:
with test_util.import_state(meta_path=[mock]):
self.init.import_module(pkg_name)
module = self.init.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 test_util.mock_modules(*modules) as mock:
with test_util.import_state(meta_path=[mock]):
self.init.import_module('a')
self.init.import_module('a.b')
module = self.init.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 test_util.mock_modules(pkg_long_name, name) as mock:
with test_util.import_state(meta_path=[mock]):
self.init.import_module(pkg_name)
module = self.init.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):
self.init.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():
self.init.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 test_util.mock_modules(*modules, module_code=code) as mock:
with test_util.import_state(meta_path=[mock]):
self.init.import_module('a.b')
self.assertEqual(b_load_count, 1)
(Frozen_ImportModuleTests,
Source_ImportModuleTests
) = test_util.test_both(ImportModuleTests, init=init)
class FindLoaderTests:
FakeMetaFinder = None
def test_sys_modules(self):
# If a module with __loader__ is in sys.modules, then return it.
name = 'some_mod'
with test_util.uncache(name):
module = types.ModuleType(name)
loader = 'a loader!'
module.__loader__ = loader
sys.modules[name] = module
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
found = self.init.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 test_util.uncache(name):
module = types.ModuleType(name)
module.__loader__ = None
sys.modules[name] = module
with self.assertRaises(ValueError):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
self.init.find_loader(name)
def test_sys_modules_loader_is_not_set(self):
# Should raise ValueError
# Issue #17099
name = 'some_mod'
with test_util.uncache(name):
module = types.ModuleType(name)
try:
del module.__loader__
except AttributeError:
pass
sys.modules[name] = module
with self.assertRaises(ValueError):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
self.init.find_loader(name)
def test_success(self):
# Return the loader found on sys.meta_path.
name = 'some_mod'
with test_util.uncache(name):
with test_util.import_state(meta_path=[self.FakeMetaFinder]):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
self.assertEqual((name, None), self.init.find_loader(name))
def test_success_path(self):
# Searching on a path should work.
name = 'some_mod'
path = 'path to some place'
with test_util.uncache(name):
with test_util.import_state(meta_path=[self.FakeMetaFinder]):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
self.assertEqual((name, path),
self.init.find_loader(name, path))
def test_nothing(self):
# None is returned upon failure to find a loader.
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
self.assertIsNone(self.init.find_loader('nevergoingtofindthismodule'))
class FindLoaderPEP451Tests(FindLoaderTests):
class FakeMetaFinder:
@staticmethod
def find_spec(name, path=None, target=None):
return machinery['Source'].ModuleSpec(name, (name, path))
(Frozen_FindLoaderPEP451Tests,
Source_FindLoaderPEP451Tests
) = test_util.test_both(FindLoaderPEP451Tests, init=init)
class FindLoaderPEP302Tests(FindLoaderTests):
class FakeMetaFinder:
@staticmethod
def find_module(name, path=None):
return name, path
(Frozen_FindLoaderPEP302Tests,
Source_FindLoaderPEP302Tests
) = test_util.test_both(FindLoaderPEP302Tests, init=init)
class ReloadTests:
def test_reload_modules(self):
for mod in ('tokenize', 'time', 'marshal'):
with self.subTest(module=mod):
with support.CleanImport(mod):
module = self.init.import_module(mod)
self.init.reload(module)
def test_module_replaced(self):
def code():
import sys
module = type(sys)('top_level')
module.spam = 3
sys.modules['top_level'] = module
mock = test_util.mock_modules('top_level',
module_code={'top_level': code})
with mock:
with test_util.import_state(meta_path=[mock]):
module = self.init.import_module('top_level')
reloaded = self.init.reload(module)
actual = sys.modules['top_level']
self.assertEqual(actual.spam, 3)
self.assertEqual(reloaded.spam, 3)
def test_reload_missing_loader(self):
with support.CleanImport('types'):
import types
loader = types.__loader__
del types.__loader__
reloaded = self.init.reload(types)
self.assertIs(reloaded, types)
self.assertIs(sys.modules['types'], types)
self.assertEqual(reloaded.__loader__.path, loader.path)
def test_reload_loader_replaced(self):
with support.CleanImport('types'):
import types
types.__loader__ = None
self.init.invalidate_caches()
reloaded = self.init.reload(types)
self.assertIsNot(reloaded.__loader__, None)
self.assertIs(reloaded, types)
self.assertIs(sys.modules['types'], types)
def test_reload_location_changed(self):
name = 'spam'
with support.temp_cwd(None) as cwd:
with test_util.uncache('spam'):
with support.DirsOnSysPath(cwd):
# Start as a plain module.
self.init.invalidate_caches()
path = os.path.join(cwd, name + '.py')
cached = self.util.cache_from_source(path)
expected = {'__name__': name,
'__package__': '',
'__file__': path,
'__cached__': cached,
'__doc__': None,
}
support.create_empty_file(path)
module = self.init.import_module(name)
ns = vars(module).copy()
loader = ns.pop('__loader__')
spec = ns.pop('__spec__')
ns.pop('__builtins__', None) # An implementation detail.
self.assertEqual(spec.name, name)
self.assertEqual(spec.loader, loader)
self.assertEqual(loader.path, path)
self.assertEqual(ns, expected)
# Change to a package.
self.init.invalidate_caches()
init_path = os.path.join(cwd, name, '__init__.py')
cached = self.util.cache_from_source(init_path)
expected = {'__name__': name,
'__package__': name,
'__file__': init_path,
'__cached__': cached,
'__path__': [os.path.dirname(init_path)],
'__doc__': None,
}
os.mkdir(name)
os.rename(path, init_path)
reloaded = self.init.reload(module)
ns = vars(reloaded).copy()
loader = ns.pop('__loader__')
spec = ns.pop('__spec__')
ns.pop('__builtins__', None) # An implementation detail.
self.assertEqual(spec.name, name)
self.assertEqual(spec.loader, loader)
self.assertIs(reloaded, module)
self.assertEqual(loader.path, init_path)
self.maxDiff = None
self.assertEqual(ns, expected)
def test_reload_namespace_changed(self):
name = 'spam'
with support.temp_cwd(None) as cwd:
with test_util.uncache('spam'):
with support.DirsOnSysPath(cwd):
# Start as a namespace package.
self.init.invalidate_caches()
bad_path = os.path.join(cwd, name, '__init.py')
cached = self.util.cache_from_source(bad_path)
expected = {'__name__': name,
'__package__': name,
'__doc__': None,
'__file__': None,
}
os.mkdir(name)
with open(bad_path, 'w') as init_file:
init_file.write('eggs = None')
module = self.init.import_module(name)
ns = vars(module).copy()
loader = ns.pop('__loader__')
path = ns.pop('__path__')
spec = ns.pop('__spec__')
ns.pop('__builtins__', None) # An implementation detail.
self.assertEqual(spec.name, name)
self.assertIsNotNone(spec.loader)
self.assertIsNotNone(loader)
self.assertEqual(spec.loader, loader)
self.assertEqual(set(path),
set([os.path.dirname(bad_path)]))
with self.assertRaises(AttributeError):
# a NamespaceLoader
loader.path
self.assertEqual(ns, expected)
# Change to a regular package.
self.init.invalidate_caches()
init_path = os.path.join(cwd, name, '__init__.py')
cached = self.util.cache_from_source(init_path)
expected = {'__name__': name,
'__package__': name,
'__file__': init_path,
'__cached__': cached,
'__path__': [os.path.dirname(init_path)],
'__doc__': None,
'eggs': None,
}
os.rename(bad_path, init_path)
reloaded = self.init.reload(module)
ns = vars(reloaded).copy()
loader = ns.pop('__loader__')
spec = ns.pop('__spec__')
ns.pop('__builtins__', None) # An implementation detail.
self.assertEqual(spec.name, name)
self.assertEqual(spec.loader, loader)
self.assertIs(reloaded, module)
self.assertEqual(loader.path, init_path)
self.assertEqual(ns, expected)
def test_reload_submodule(self):
# See #19851.
name = 'spam'
subname = 'ham'
with test_util.temp_module(name, pkg=True) as pkg_dir:
fullname, _ = test_util.submodule(name, subname, pkg_dir)
ham = self.init.import_module(fullname)
reloaded = self.init.reload(ham)
self.assertIs(reloaded, ham)
def test_module_missing_spec(self):
#Test that reload() throws ModuleNotFounderror when reloading
# a module who's missing a spec. (bpo-29851)
name = 'spam'
with test_util.uncache(name):
module = sys.modules[name] = types.ModuleType(name)
# Sanity check by attempting an import.
module = self.init.import_module(name)
self.assertIsNone(module.__spec__)
with self.assertRaises(ModuleNotFoundError):
self.init.reload(module)
(Frozen_ReloadTests,
Source_ReloadTests
) = test_util.test_both(ReloadTests, init=init, util=util)
class InvalidateCacheTests:
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))
self.init.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] = None
self.addCleanup(lambda: sys.path_importer_cache.pop(key, None))
self.init.invalidate_caches() # Shouldn't trigger an exception.
(Frozen_InvalidateCacheTests,
Source_InvalidateCacheTests
) = test_util.test_both(InvalidateCacheTests, init=init)
class FrozenImportlibTests(unittest.TestCase):
def test_no_frozen_importlib(self):
# Should be able to import w/o _frozen_importlib being defined.
# Can't do an isinstance() check since separate copies of importlib
# may have been used for import, so just check the name is not for the
# frozen loader.
source_init = init['Source']
self.assertNotEqual(source_init.__loader__.__class__.__name__,
'FrozenImporter')
class StartupTests:
def test_everyone_has___loader__(self):
# Issue #17098: all modules should have __loader__ defined.
for name, module in sys.modules.items():
if isinstance(module, types.ModuleType):
with self.subTest(name=name):
self.assertTrue(hasattr(module, '__loader__'),
'{!r} lacks a __loader__ attribute'.format(name))
if self.machinery.BuiltinImporter.find_module(name):
self.assertIsNot(module.__loader__, None)
elif self.machinery.FrozenImporter.find_module(name):
self.assertIsNot(module.__loader__, None)
def test_everyone_has___spec__(self):
for name, module in sys.modules.items():
if isinstance(module, types.ModuleType):
with self.subTest(name=name):
self.assertTrue(hasattr(module, '__spec__'))
if self.machinery.BuiltinImporter.find_module(name):
self.assertIsNot(module.__spec__, None)
elif self.machinery.FrozenImporter.find_module(name):
self.assertIsNot(module.__spec__, None)
(Frozen_StartupTests,
Source_StartupTests
) = test_util.test_both(StartupTests, machinery=machinery)
if __name__ == '__main__':
unittest.main()
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