importlib.metadata: Improve and test SimplePath protocol (#11436)

Co-authored-by: layday <layday@protonmail.com>

test_cases/stdlib/check_importlib_metadata.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import sys
+from _typeshed import StrPath
+from os import PathLike
+from pathlib import Path
+from typing import Any
+from zipfile import Path as ZipPath
+
+if sys.version_info >= (3, 10):
+    from importlib.metadata._meta import SimplePath
+
+    # Simplified version of zipfile.Path
+    class MyPath:
+        @property
+        def parent(self) -> PathLike[str]: ...  # undocumented
+
+        def read_text(self, encoding: str | None = ..., errors: str | None = ...) -> str: ...
+        def joinpath(self, *other: StrPath) -> MyPath: ...
+        def __truediv__(self, add: StrPath) -> MyPath: ...
+
+    if sys.version_info >= (3, 12):
+
+        def takes_simple_path(p: SimplePath[Any]) -> None: ...
+
+    else:
+
+        def takes_simple_path(p: SimplePath) -> None: ...
+
+    takes_simple_path(Path())
+    takes_simple_path(ZipPath(""))
+    takes_simple_path(MyPath())
+    takes_simple_path("some string")  # type: ignore