type annotate the rest of twisted.test.test_paths

pyproject.toml

@@ -608,7 +608,6 @@ module = [
     'twisted.test.test_main',
     'twisted.test.test_memcache',
     'twisted.test.test_modules',
-    'twisted.test.test_paths',
     'twisted.test.test_pcp',
     'twisted.test.test_policies',
     'twisted.test.test_postfix',

src/twisted/test/test_paths.py

@@ -8,16 +8,20 @@
 from __future__ import annotations
 
 import errno
+import io
 import os
 import pickle
 import stat
+import sys
 import time
 from pprint import pformat
 from typing import IO, AnyStr, Callable, Dict, List, Optional, Tuple, TypeVar, Union
 from unittest import skipIf
 
 from zope.interface.verify import verifyObject
 
+from typing_extensions import NoReturn
+
 from twisted.python import filepath
 from twisted.python.filepath import FileMode, OtherAnyStr
 from twisted.python.runtime import platform
@@ -47,15 +51,15 @@ class AbstractFilePathTests(BytesTestCase):
     f1content = b"file 1"
     f2content = b"file 2"
 
-    def _mkpath(self, *p):
+    def _mkpath(self, *p: bytes) -> bytes:
         x = os.path.abspath(os.path.join(self.cmn, *p))
         self.all.append(x)
         return x
 
-    def subdir(self, *dirname):
+    def subdir(self, *dirname: bytes) -> None:
         os.mkdir(self._mkpath(*dirname))
 
-    def subfile(self, *dirname):
+    def subfile(self, *dirname: bytes) -> io.BufferedWriter:
         return open(self._mkpath(*dirname), "wb")
 
     def setUp(self) -> None:
@@ -254,13 +258,19 @@ def listdir(self) -> List[AnyStr]:
         )
 
 
+if sys.platform != "win32":
+
+    class WindowsError:
+        pass
+
+
 class ListingCompatibilityTests(BytesTestCase):
     """
     These tests verify compatibility with legacy behavior of directory listing.
     """
 
     @skipIf(not platform.isWindows(), "Only relevant on on Windows.")
-    def test_windowsErrorExcept(self):
+    def test_windowsErrorExcept(self) -> None:
         """
         Verify that when a WindowsError is raised from listdir, catching
         WindowsError works.
@@ -303,13 +313,13 @@ class ExplodingFile:
 
     closed = False
 
-    def read(self, n=0):
+    def read(self, n: int = 0) -> NoReturn:
         """
         @raise IOError: Always raised.
         """
         raise OSError()
 
-    def write(self, what):
+    def write(self, what: bytes) -> NoReturn:
         """
         @raise IOError: Always raised.
         """