Another attempt to appease the type checker

Author: jahrules

tests/test_filelock.py

@@ -500,8 +500,8 @@ def test_wrong_platform(tmp_path: Path) -> None:
 @pytest.mark.skipif(sys.platform == "win32", reason="Windows filesystems support flock")
 def test_flock_not_implemented_unix(tmp_path: Path) -> None:
     import fcntl
-    def dummy_flock(fd: IO, operation: str) -> None:
-        if fd != operation:  # fd and operation will never be equal
+    def dummy_flock(fd: IO[Any], operation: str) -> None:
+        if operation not in fd:  # fd and operation will never be equal
             raise OSError(ENOSYS, "mock error")
 
     lock_path = tmp_path / "a.lock"