Fix various typing errors on Windows

tests/lib/__init__.py

@@ -266,14 +266,14 @@ class TestPipResult:
     if sys.platform == "win32":
 
         @property
-        def stdout(self):
+        def stdout(self) -> str:
             return self._impl.stdout.replace("\r\n", "\n")
 
         @property
-        def stderr(self):
+        def stderr(self) -> str:
             return self._impl.stderr.replace("\r\n", "\n")
 
-        def __str__(self):
+        def __str__(self) -> str:
             return str(self._impl).replace("\r\n", "\n")
 
     else:
@@ -618,7 +618,7 @@ class PipTestEnvironment(TestFileEnvironment):
         cwd = cwd or self.cwd
         if sys.platform == "win32":
             # Partial fix for ScriptTest.run using `shell=True` on Windows.
-            args = [str(a).replace("^", "^^").replace("&", "^&") for a in args]
+            args = tuple(str(a).replace("^", "^^").replace("&", "^&") for a in args)
 
         if allow_error:
             kw["expect_error"] = True

tests/lib/server.py

@@ -14,7 +14,7 @@ from werkzeug.serving import make_server as _make_server
 from .compat import nullcontext
 
 if TYPE_CHECKING:
-    from wsgi import StartResponse, WSGIApplication, WSGIEnvironment
+    from _typeshed.wsgi import StartResponse, WSGIApplication, WSGIEnvironment
 
 Body = Iterable[bytes]
 
@@ -23,7 +23,7 @@ class MockServer(BaseWSGIServer):
     mock: Mock = Mock()
 
 
-# Applies on Python 2 and Windows.
+# Applies on Windows.
 if not hasattr(signal, "pthread_sigmask"):
     # We're not relying on this behavior anywhere currently, it's just best
     # practice.
@@ -41,11 +41,17 @@ else:
         except AttributeError:
             mask = set(range(1, signal.NSIG))
 
-        old_mask = signal.pthread_sigmask(signal.SIG_SETMASK, mask)
+        old_mask = signal.pthread_sigmask(  # type: ignore[attr-defined]
+            signal.SIG_SETMASK,  # type: ignore[attr-defined]
+            mask,
+        )
         try:
             yield
         finally:
-            signal.pthread_sigmask(signal.SIG_SETMASK, old_mask)
+            signal.pthread_sigmask(  # type: ignore[attr-defined]
+                signal.SIG_SETMASK,  # type: ignore[attr-defined]
+                old_mask,
+            )
 
 
 class _RequestHandler(WSGIRequestHandler):

tests/unit/test_appdirs.py

@@ -65,7 +65,11 @@ class TestUserCacheDir:
         def my_get_win_folder(csidl_name: str) -> str:
             return "\u00DF\u00E4\u03B1\u20AC"
 
-        monkeypatch.setattr(platformdirs.windows, "get_win_folder", my_get_win_folder)
+        monkeypatch.setattr(
+            platformdirs.windows,  # type: ignore[attr-defined]
+            "get_win_folder",
+            my_get_win_folder,
+        )
 
         # Do not use the isinstance expression directly in the
         # assert statement, as the Unicode characters in the result

tests/unit/test_locations.py

@@ -51,10 +51,9 @@ class TestLocations:
         # now patch
         tempfile.gettempdir = lambda: self.tempdir
         getpass.getuser = lambda: self.username
-        os.geteuid = lambda: self.st_uid
         os.fstat = lambda fd: self.get_mock_fstat(fd)
-
         if sys.platform != "win32":
+            os.geteuid = lambda: self.st_uid
             pwd.getpwuid = self.get_mock_getpwuid
 
     def revert_patch(self) -> None: