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import os
import sys
from unittest import TestCase
from zipimport import zipimporter
from django.utils.importlib import import_module
from django.utils.module_loading import module_has_submodule
class DefaultLoader(TestCase):
def test_loader(self):
"Normal module existence can be tested"
test_module = import_module('regressiontests.utils.test_module')
# 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')
class EggLoader(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 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)
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