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_pure_wheel.py

@@ -1,4 +1,5 @@
 import subprocess
+from pathlib import Path
 
 import pytest
 
@@ -23,7 +24,7 @@ def a_function():
 """
 
 
-def test(tmp_path, capfd):
+def test(tmp_path: Path, capfd: pytest.CaptureFixture[str]) -> None:
     # this test checks that if a pure wheel is generated, the build should
     # fail.
     project_dir = tmp_path / "project"