django/tests/regressiontests/utils/module_loading.py

157 lines
6.0 KiB
Python
Raw Normal View History

import os
import sys
import imp
from zipimport import zipimporter
from django.utils import unittest
from django.utils.importlib import import_module
from django.utils.module_loading import module_has_submodule
class DefaultLoader(unittest.TestCase):
def setUp(self):
sys.meta_path.insert(0, ProxyFinder())
def tearDown(self):
sys.meta_path.pop(0)
def test_loader(self):
"Normal module existence can be tested"
test_module = import_module('regressiontests.utils.test_module')
test_no_submodule = import_module(
'regressiontests.utils.test_no_submodule')
# An importable child
self.assertTrue(module_has_submodule(test_module, 'good_module'))
mod = import_module('regressiontests.utils.test_module.good_module')
self.assertEqual(mod.content, 'Good Module')
# A child that exists, but will generate an import error if loaded
self.assertTrue(module_has_submodule(test_module, 'bad_module'))
self.assertRaises(ImportError, import_module, 'regressiontests.utils.test_module.bad_module')
# A child that doesn't exist
self.assertFalse(module_has_submodule(test_module, 'no_such_module'))
self.assertRaises(ImportError, import_module, 'regressiontests.utils.test_module.no_such_module')
# A child that doesn't exist, but is the name of a package on the path
self.assertFalse(module_has_submodule(test_module, 'django'))
self.assertRaises(ImportError, import_module, 'regressiontests.utils.test_module.django')
# Don't be confused by caching of import misses
import types # causes attempted import of regressiontests.utils.types
self.assertFalse(module_has_submodule(sys.modules['regressiontests.utils'], 'types'))
# A module which doesn't have a __path__ (so no submodules)
self.assertFalse(module_has_submodule(test_no_submodule, 'anything'))
self.assertRaises(ImportError, import_module,
'regressiontests.utils.test_no_submodule.anything')
class EggLoader(unittest.TestCase):
def setUp(self):
self.old_path = sys.path[:]
self.egg_dir = '%s/eggs' % os.path.dirname(__file__)
def tearDown(self):
sys.path = self.old_path
sys.path_importer_cache.clear()
sys.modules.pop('egg_module.sub1.sub2.bad_module', None)
sys.modules.pop('egg_module.sub1.sub2.good_module', None)
sys.modules.pop('egg_module.sub1.sub2', None)
sys.modules.pop('egg_module.sub1', None)
sys.modules.pop('egg_module.bad_module', None)
sys.modules.pop('egg_module.good_module', None)
sys.modules.pop('egg_module', None)
def test_shallow_loader(self):
"Module existence can be tested inside eggs"
egg_name = '%s/test_egg.egg' % self.egg_dir
sys.path.append(egg_name)
egg_module = import_module('egg_module')
# An importable child
self.assertTrue(module_has_submodule(egg_module, 'good_module'))
mod = import_module('egg_module.good_module')
self.assertEqual(mod.content, 'Good Module')
# A child that exists, but will generate an import error if loaded
self.assertTrue(module_has_submodule(egg_module, 'bad_module'))
self.assertRaises(ImportError, import_module, 'egg_module.bad_module')
# A child that doesn't exist
self.assertFalse(module_has_submodule(egg_module, 'no_such_module'))
self.assertRaises(ImportError, import_module, 'egg_module.no_such_module')
def test_deep_loader(self):
"Modules deep inside an egg can still be tested for existence"
egg_name = '%s/test_egg.egg' % self.egg_dir
sys.path.append(egg_name)
egg_module = import_module('egg_module.sub1.sub2')
# An importable child
self.assertTrue(module_has_submodule(egg_module, 'good_module'))
mod = import_module('egg_module.sub1.sub2.good_module')
self.assertEqual(mod.content, 'Deep Good Module')
# A child that exists, but will generate an import error if loaded
self.assertTrue(module_has_submodule(egg_module, 'bad_module'))
self.assertRaises(ImportError, import_module, 'egg_module.sub1.sub2.bad_module')
# A child that doesn't exist
self.assertFalse(module_has_submodule(egg_module, 'no_such_module'))
self.assertRaises(ImportError, import_module, 'egg_module.sub1.sub2.no_such_module')
class ProxyFinder(object):
def __init__(self):
self._cache = {}
def find_module(self, fullname, path=None):
tail = fullname.rsplit('.', 1)[-1]
try:
self._cache[fullname] = imp.find_module(tail, path)
except ImportError:
return None
else:
return self # this is a loader as well
def load_module(self, fullname):
if fullname in sys.modules:
return sys.modules[fullname]
fd, fn, info = self._cache[fullname]
return imp.load_module(fullname, fd, fn, info)
class TestFinder(object):
def __init__(self, *args, **kwargs):
self.importer = zipimporter(*args, **kwargs)
def find_module(self, path):
importer = self.importer.find_module(path)
if importer is None:
return
return TestLoader(importer)
class TestLoader(object):
def __init__(self, importer):
self.importer = importer
def load_module(self, name):
mod = self.importer.load_module(name)
mod.__loader__ = self
return mod
class CustomLoader(EggLoader):
"""The Custom Loader test is exactly the same as the EggLoader, but
it uses a custom defined Loader and Finder that is intentionally
split into two classes. Although the EggLoader combines both functions
into one class, this isn't required.
"""
def setUp(self):
super(CustomLoader, self).setUp()
sys.path_hooks.insert(0, TestFinder)
sys.path_importer_cache.clear()
def tearDown(self):
super(CustomLoader, self).tearDown()
sys.path_hooks.pop(0)