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275 lines
11 KiB
Python
275 lines
11 KiB
Python
import imp
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import os
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import sys
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import unittest
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import warnings
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from importlib import import_module
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from zipimport import zipimporter
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from django.core.exceptions import ImproperlyConfigured
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from django.test import SimpleTestCase, ignore_warnings, modify_settings
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from django.test.utils import extend_sys_path
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from django.utils import six
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from django.utils._os import upath
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from django.utils.deprecation import RemovedInDjango19Warning
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from django.utils.module_loading import (
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autodiscover_modules, import_by_path, import_string, module_has_submodule,
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)
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class DefaultLoader(unittest.TestCase):
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def setUp(self):
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sys.meta_path.insert(0, ProxyFinder())
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def tearDown(self):
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sys.meta_path.pop(0)
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def test_loader(self):
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"Normal module existence can be tested"
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test_module = import_module('utils_tests.test_module')
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test_no_submodule = import_module(
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'utils_tests.test_no_submodule')
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# An importable child
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self.assertTrue(module_has_submodule(test_module, 'good_module'))
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mod = import_module('utils_tests.test_module.good_module')
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self.assertEqual(mod.content, 'Good Module')
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# A child that exists, but will generate an import error if loaded
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self.assertTrue(module_has_submodule(test_module, 'bad_module'))
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self.assertRaises(ImportError, import_module, 'utils_tests.test_module.bad_module')
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# A child that doesn't exist
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self.assertFalse(module_has_submodule(test_module, 'no_such_module'))
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self.assertRaises(ImportError, import_module, 'utils_tests.test_module.no_such_module')
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# A child that doesn't exist, but is the name of a package on the path
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self.assertFalse(module_has_submodule(test_module, 'django'))
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self.assertRaises(ImportError, import_module, 'utils_tests.test_module.django')
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# Don't be confused by caching of import misses
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import types # NOQA: causes attempted import of utils_tests.types
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self.assertFalse(module_has_submodule(sys.modules['utils_tests'], 'types'))
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# A module which doesn't have a __path__ (so no submodules)
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self.assertFalse(module_has_submodule(test_no_submodule, 'anything'))
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self.assertRaises(ImportError, import_module,
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'utils_tests.test_no_submodule.anything')
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class EggLoader(unittest.TestCase):
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def setUp(self):
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self.egg_dir = '%s/eggs' % os.path.dirname(upath(__file__))
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def tearDown(self):
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sys.path_importer_cache.clear()
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sys.modules.pop('egg_module.sub1.sub2.bad_module', None)
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sys.modules.pop('egg_module.sub1.sub2.good_module', None)
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sys.modules.pop('egg_module.sub1.sub2', None)
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sys.modules.pop('egg_module.sub1', None)
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sys.modules.pop('egg_module.bad_module', None)
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sys.modules.pop('egg_module.good_module', None)
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sys.modules.pop('egg_module', None)
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def test_shallow_loader(self):
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"Module existence can be tested inside eggs"
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egg_name = '%s/test_egg.egg' % self.egg_dir
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with extend_sys_path(egg_name):
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egg_module = import_module('egg_module')
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# An importable child
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self.assertTrue(module_has_submodule(egg_module, 'good_module'))
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mod = import_module('egg_module.good_module')
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self.assertEqual(mod.content, 'Good Module')
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# A child that exists, but will generate an import error if loaded
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self.assertTrue(module_has_submodule(egg_module, 'bad_module'))
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self.assertRaises(ImportError, import_module, 'egg_module.bad_module')
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# A child that doesn't exist
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self.assertFalse(module_has_submodule(egg_module, 'no_such_module'))
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self.assertRaises(ImportError, import_module, 'egg_module.no_such_module')
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def test_deep_loader(self):
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"Modules deep inside an egg can still be tested for existence"
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egg_name = '%s/test_egg.egg' % self.egg_dir
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with extend_sys_path(egg_name):
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egg_module = import_module('egg_module.sub1.sub2')
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# An importable child
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self.assertTrue(module_has_submodule(egg_module, 'good_module'))
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mod = import_module('egg_module.sub1.sub2.good_module')
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self.assertEqual(mod.content, 'Deep Good Module')
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# A child that exists, but will generate an import error if loaded
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self.assertTrue(module_has_submodule(egg_module, 'bad_module'))
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self.assertRaises(ImportError, import_module, 'egg_module.sub1.sub2.bad_module')
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# A child that doesn't exist
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self.assertFalse(module_has_submodule(egg_module, 'no_such_module'))
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self.assertRaises(ImportError, import_module, 'egg_module.sub1.sub2.no_such_module')
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@ignore_warnings(category=RemovedInDjango19Warning)
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class ModuleImportTestCase(unittest.TestCase):
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def test_import_by_path(self):
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cls = import_by_path('django.utils.module_loading.import_by_path')
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self.assertEqual(cls, import_by_path)
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# Test exceptions raised
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for path in ('no_dots_in_path', 'unexistent.path', 'utils_tests.unexistent'):
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self.assertRaises(ImproperlyConfigured, import_by_path, path)
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with self.assertRaises(ImproperlyConfigured) as cm:
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import_by_path('unexistent.module.path', error_prefix="Foo")
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self.assertTrue(str(cm.exception).startswith('Foo'))
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def test_import_error_traceback(self):
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"""Test preserving the original traceback on an ImportError."""
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try:
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import_by_path('test_module.bad_module.content')
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except ImproperlyConfigured:
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traceback = sys.exc_info()[2]
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self.assertIsNotNone(traceback.tb_next.tb_next,
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'Should have more than the calling frame in the traceback.')
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def test_import_by_path_pending_deprecation_warning(self):
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always', category=RemovedInDjango19Warning)
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cls = import_by_path('django.utils.module_loading.import_by_path')
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self.assertEqual(cls, import_by_path)
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self.assertEqual(len(w), 1)
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self.assertTrue(issubclass(w[-1].category, RemovedInDjango19Warning))
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self.assertIn('deprecated', str(w[-1].message))
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def test_import_string(self):
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cls = import_string('django.utils.module_loading.import_string')
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self.assertEqual(cls, import_string)
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# Test exceptions raised
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self.assertRaises(ImportError, import_string, 'no_dots_in_path')
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self.assertRaises(ImportError, import_string, 'unexistent.path')
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msg = 'Module "utils_tests" does not define a "unexistent" attribute'
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with six.assertRaisesRegex(self, ImportError, msg):
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import_string('utils_tests.unexistent')
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@modify_settings(INSTALLED_APPS={'append': 'utils_tests.test_module'})
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class AutodiscoverModulesTestCase(SimpleTestCase):
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def tearDown(self):
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sys.path_importer_cache.clear()
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sys.modules.pop('utils_tests.test_module.another_bad_module', None)
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sys.modules.pop('utils_tests.test_module.another_good_module', None)
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sys.modules.pop('utils_tests.test_module.bad_module', None)
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sys.modules.pop('utils_tests.test_module.good_module', None)
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sys.modules.pop('utils_tests.test_module', None)
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def test_autodiscover_modules_found(self):
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autodiscover_modules('good_module')
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def test_autodiscover_modules_not_found(self):
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autodiscover_modules('missing_module')
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def test_autodiscover_modules_found_but_bad_module(self):
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with six.assertRaisesRegex(self, ImportError, "No module named '?a_package_name_that_does_not_exist'?"):
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autodiscover_modules('bad_module')
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def test_autodiscover_modules_several_one_bad_module(self):
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with six.assertRaisesRegex(self, ImportError, "No module named '?a_package_name_that_does_not_exist'?"):
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autodiscover_modules('good_module', 'bad_module')
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def test_autodiscover_modules_several_found(self):
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autodiscover_modules('good_module', 'another_good_module')
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def test_autodiscover_modules_several_found_with_registry(self):
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from .test_module import site
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autodiscover_modules('good_module', 'another_good_module', register_to=site)
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self.assertEqual(site._registry, {'lorem': 'ipsum'})
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def test_validate_registry_keeps_intact(self):
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from .test_module import site
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with six.assertRaisesRegex(self, Exception, "Some random exception."):
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autodiscover_modules('another_bad_module', register_to=site)
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self.assertEqual(site._registry, {})
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def test_validate_registry_resets_after_erroneous_module(self):
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from .test_module import site
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with six.assertRaisesRegex(self, Exception, "Some random exception."):
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autodiscover_modules('another_good_module', 'another_bad_module', register_to=site)
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self.assertEqual(site._registry, {'lorem': 'ipsum'})
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def test_validate_registry_resets_after_missing_module(self):
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from .test_module import site
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autodiscover_modules('does_not_exist', 'another_good_module', 'does_not_exist2', register_to=site)
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self.assertEqual(site._registry, {'lorem': 'ipsum'})
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class ProxyFinder(object):
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def __init__(self):
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self._cache = {}
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def find_module(self, fullname, path=None):
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tail = fullname.rsplit('.', 1)[-1]
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try:
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fd, fn, info = imp.find_module(tail, path)
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if fullname in self._cache:
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old_fd = self._cache[fullname][0]
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if old_fd:
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old_fd.close()
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self._cache[fullname] = (fd, fn, info)
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except ImportError:
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return None
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else:
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return self # this is a loader as well
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def load_module(self, fullname):
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if fullname in sys.modules:
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return sys.modules[fullname]
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fd, fn, info = self._cache[fullname]
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try:
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return imp.load_module(fullname, fd, fn, info)
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finally:
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if fd:
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fd.close()
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class TestFinder(object):
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def __init__(self, *args, **kwargs):
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self.importer = zipimporter(*args, **kwargs)
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def find_module(self, path):
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importer = self.importer.find_module(path)
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if importer is None:
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return
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return TestLoader(importer)
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class TestLoader(object):
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def __init__(self, importer):
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self.importer = importer
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def load_module(self, name):
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mod = self.importer.load_module(name)
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mod.__loader__ = self
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return mod
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class CustomLoader(EggLoader):
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"""The Custom Loader test is exactly the same as the EggLoader, but
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it uses a custom defined Loader and Finder that is intentionally
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split into two classes. Although the EggLoader combines both functions
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into one class, this isn't required.
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"""
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def setUp(self):
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super(CustomLoader, self).setUp()
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sys.path_hooks.insert(0, TestFinder)
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sys.path_importer_cache.clear()
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def tearDown(self):
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super(CustomLoader, self).tearDown()
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sys.path_hooks.pop(0)
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