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229 lines
8.9 KiB
Python
229 lines
8.9 KiB
Python
import os
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import sys
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import unittest
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from importlib import import_module
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from zipimport import zipimporter
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from django.test import SimpleTestCase, modify_settings
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from django.test.utils import extend_sys_path
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from django.utils.module_loading import (
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autodiscover_modules,
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import_string,
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module_has_submodule,
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)
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class DefaultLoader(unittest.TestCase):
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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("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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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import_module("utils_tests.test_no_submodule.anything")
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def test_has_sumbodule_with_dotted_path(self):
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"""Nested module existence can be tested."""
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test_module = import_module("utils_tests.test_module")
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# A grandchild that exists.
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self.assertIs(
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module_has_submodule(test_module, "child_module.grandchild_module"), True
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)
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# A grandchild that doesn't exist.
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self.assertIs(
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module_has_submodule(test_module, "child_module.no_such_module"), False
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)
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# A grandchild whose parent doesn't exist.
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self.assertIs(
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module_has_submodule(test_module, "no_such_module.grandchild_module"), False
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)
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# A grandchild whose parent is not a package.
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self.assertIs(
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module_has_submodule(test_module, "good_module.no_such_module"), False
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)
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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(__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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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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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with self.assertRaises(ImportError):
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import_module("egg_module.sub1.sub2.no_such_module")
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class ModuleImportTests(SimpleTestCase):
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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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with self.assertRaises(ImportError):
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import_string("no_dots_in_path")
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msg = 'Module "utils_tests" does not define a "unexistent" attribute'
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with self.assertRaisesMessage(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 self.assertRaisesMessage(
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ImportError, "No module named 'a_package_name_that_does_not_exist'"
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):
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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 self.assertRaisesMessage(
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ImportError, "No module named 'a_package_name_that_does_not_exist'"
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):
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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 self.assertRaisesMessage(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 self.assertRaisesMessage(Exception, "Some random exception."):
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autodiscover_modules(
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"another_good_module", "another_bad_module", register_to=site
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)
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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(
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"does_not_exist", "another_good_module", "does_not_exist2", register_to=site
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)
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self.assertEqual(site._registry, {"lorem": "ipsum"})
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class TestFinder:
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def __init__(self, *args, **kwargs):
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self.importer = zipimporter(*args, **kwargs)
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def find_spec(self, path, target=None):
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return self.importer.find_spec(path, target)
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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 class. Although the EggLoader combines both
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functions into one class, this isn't required.
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"""
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def setUp(self):
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super().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().tearDown()
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sys.path_hooks.pop(0)
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