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_pyodide.py

@@ -3,6 +3,7 @@ import os
 import subprocess
 import sys
 import textwrap
+from pathlib import Path
 
 import pytest
 
@@ -48,7 +49,7 @@ if __name__ == "__main__":
 
 
 @pytest.mark.parametrize("use_pyproject_toml", [True, False])
-def test_pyodide_build(tmp_path, use_pyproject_toml):
+def test_pyodide_build(tmp_path: Path, use_pyproject_toml: bool) -> None:
     if sys.platform == "win32":
         pytest.skip("pyodide-build doesn't work correctly on Windows")
 
@@ -88,7 +89,7 @@ def test_pyodide_build(tmp_path, use_pyproject_toml):
     assert set(actual_wheels) == set(expected_wheels)
 
 
-def test_pyodide_version_incompatible(tmp_path, capfd):
+def test_pyodide_version_incompatible(tmp_path: Path, capfd: pytest.CaptureFixture[str]) -> None:
     if sys.platform == "win32":
         pytest.skip("pyodide-build doesn't work correctly on Windows")
 
@@ -110,19 +111,19 @@ def test_pyodide_version_incompatible(tmp_path, capfd):
 
 
 @pytest.mark.parametrize("expect_failure", [True, False])
-def test_pyodide_build_and_test(tmp_path, expect_failure):
+def test_pyodide_build_and_test(tmp_path: Path, expect_failure: bool) -> None:
     if sys.platform == "win32":
         pytest.skip("pyodide-build doesn't work correctly on Windows")
 
     if expect_failure:
         basic_project.files["test/spam_test.py"] = textwrap.dedent(r"""
-            def test_filter():
+            def test_filter() -> None:
                 assert 0 == 1
         """)
     else:
         basic_project.files["test/spam_test.py"] = textwrap.dedent(r"""
             import spam
-            def test_filter():
+            def test_filter() -> None:
                 assert spam.filter("spam") == 0
         """)
     basic_project.generate(tmp_path)
@@ -149,7 +150,7 @@ def test_pyodide_build_and_test(tmp_path, expect_failure):
         assert set(actual_wheels) == set(expected_wheels)
 
 
-def test_pyodide_repair_wheel(tmp_path):
+def test_pyodide_repair_wheel(tmp_path: Path) -> None:
     if sys.platform == "win32":
         pytest.skip("pyodide-build doesn't work correctly on Windows")