Fix wiring module loader uninstallation issue

docs/main/changelog.rst

@@ -12,6 +12,7 @@ Development version
 - Implement providers' lazy initialization.
 - Improve providers' copying.
 - Improve typing in wiring module.
+- Fix wiring module loader uninstallation issue.
 
 4.30.0
 ------

src/dependency_injector/wiring.py

@@ -860,7 +860,7 @@ class AutoLoader:
 
     @property
     def installed(self):
-        return self._path_hook is not None
+        return self._path_hook in sys.path_hooks
 
     def install(self):
         if self.installed:

tests/unit/wiring/test_wiring_string_ids_py36.py

@@ -1,4 +1,6 @@
+import contextlib
 from decimal import Decimal
+import importlib
 import unittest
 
 from dependency_injector.wiring import (
@@ -6,6 +8,8 @@ from dependency_injector.wiring import (
     Provide,
     Provider,
     Closing,
+    register_loader_containers,
+    unregister_loader_containers,
 )
 from dependency_injector import containers, providers, errors
 
@@ -409,27 +413,27 @@ class WiringAsyncInjectionsTest(AsyncTestCase):
         self.assertEqual(asyncinjections.resource2.shutdown_counter, 2)
 
 
-# class AutoLoaderTest(unittest.TestCase):
-#
-#     container: Container
-#
-#     def setUp(self) -> None:
-#         self.container = Container(config={'a': {'b': {'c': 10}}})
-#         importlib.reload(module)
-#
-#     def tearDown(self) -> None:
-#         with contextlib.suppress(ValueError):
-#             unregister_loader_containers(self.container)
-#
-#         self.container.unwire()
-#
-#     @classmethod
-#     def tearDownClass(cls) -> None:
-#         importlib.reload(module)
-#
-#     def test_register_container(self):
-#         register_loader_containers(self.container)
-#         importlib.reload(module)
-#
-#         service = module.test_function()
-#         self.assertIsInstance(service, Service)
+class AutoLoaderTest(unittest.TestCase):
+
+    container: Container
+
+    def setUp(self) -> None:
+        self.container = Container(config={'a': {'b': {'c': 10}}})
+        importlib.reload(module)
+
+    def tearDown(self) -> None:
+        with contextlib.suppress(ValueError):
+            unregister_loader_containers(self.container)
+
+        self.container.unwire()
+
+    @classmethod
+    def tearDownClass(cls) -> None:
+        importlib.reload(module)
+
+    def test_register_container(self):
+        register_loader_containers(self.container)
+        importlib.reload(module)
+
+        service = module.test_function()
+        self.assertIsInstance(service, Service)