tests: fully type the test suite (#2794)

* tests: fully type the test suite

* chore: require more typing

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

test/test_linux_python.py

@@ -1,12 +1,13 @@
 import platform
 import subprocess
+from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
 
-def test_python_exist(tmp_path, capfd):
+def test_python_exist(tmp_path: Path, capfd: pytest.CaptureFixture[str]) -> None:
     if utils.get_platform() != "linux":
         pytest.skip("the test is only relevant to the linux build")
     machine = platform.machine()