test: use builtins for type annotations instead of List / Optional

tests/procs.py

@@ -1,19 +1,19 @@
 import subprocess
 from pathlib import Path
-from typing import IO, Any, List, Optional, Union
+from typing import IO, Any
 
-_FILE = Union[None, int, IO[Any]]
-_DIR = Union[None, Path, str]
+_FILE = None | int | IO[Any]
+_DIR = None | Path | str
 
 
 def run(
-    cmd: List[str],
+    cmd: list[str],
     text: bool = True,
     check: bool = True,
     cwd: _DIR = None,
     stderr: _FILE = None,
     stdout: _FILE = None,
-    env: Optional[dict[str, str]] = None,
+    env: dict[str, str] | None = None,
 ) -> subprocess.CompletedProcess:
     if cwd is not None:
         print(f"cd {cwd}")

tests/test_use_nix.py

@@ -2,7 +2,6 @@ import os
 import subprocess
 import sys
 import unittest
-from typing import Optional
 
 import pytest
 
@@ -11,7 +10,7 @@ from .procs import run
 
 
 def direnv_exec(
-    direnv_project: DirenvProject, cmd: str, env: Optional[dict[str, str]] = None
+    direnv_project: DirenvProject, cmd: str, env: dict[str, str] | None = None
 ) -> None:
     args = ["direnv", "exec", str(direnv_project.directory), "sh", "-c", cmd]
     print("$ " + " ".join(args))