Use protocols instead of importlib.abc.Loader/MetaPathFinder/PathEntryFinder (#11890)

stdlib/@tests/test_cases/check_importlib.py

@@ -1,7 +1,14 @@
+from __future__ import annotations
+
 import importlib.abc
+import importlib.util
 import pathlib
 import sys
 import zipfile
+from collections.abc import Sequence
+from importlib.machinery import ModuleSpec
+from types import ModuleType
+from typing_extensions import Self
 
 # Assert that some Path classes are Traversable.
 if sys.version_info >= (3, 9):
@@ -11,3 +18,30 @@ if sys.version_info >= (3, 9):
 
     traverse(pathlib.Path())
     traverse(zipfile.Path(""))
+
+
+class MetaFinder:
+    @classmethod
+    def find_spec(cls, fullname: str, path: Sequence[str] | None, target: ModuleType | None = None) -> ModuleSpec | None:
+        return None  # simplified mock for demonstration purposes only
+
+
+class PathFinder:
+    @classmethod
+    def path_hook(cls, path_entry: str) -> type[Self]:
+        return cls  # simplified mock for demonstration purposes only
+
+    @classmethod
+    def find_spec(cls, fullname: str, target: ModuleType | None = None) -> ModuleSpec | None:
+        return None  # simplified mock for demonstration purposes only
+
+
+class Loader:
+    @classmethod
+    def load_module(cls, fullname: str) -> ModuleType:
+        return ModuleType(fullname)
+
+
+sys.meta_path.append(MetaFinder)
+sys.path_hooks.append(PathFinder.path_hook)
+importlib.util.spec_from_loader("xxxx42xxxx", Loader)