fix: noxfile added to mypy, three fixes (#408)

Adding mypy checking found three (edit: technically two, the Path/str
one is a bug in nox's types, I think) bugs in the noxfile. One of them
closes #404.

Signed-off-by: Henry Schreiner <[email protected]>

.pre-commit-config.yaml

@@ -69,7 +69,7 @@ repos:
             tests/packages/dynamic_metadata/src/dynamic/__init__.py|
             tests/packages/.*/setup.py
           )
-        files: ^(src|tests)
+        files: ^(src|tests|noxfile.py)
         args: []
         additional_dependencies:
           - build
@@ -81,6 +81,7 @@ repos:
           - importlib-resources
           - markdown-it-py<3 # Python 3.7 compat needed for mypy check
           - ninja
+          - nox
           - packaging
           - pyproject_metadata
           - pytest

noxfile.py

@@ -36,7 +36,7 @@ def pylint(session: nox.Session) -> None:
 def _run_tests(
     session: nox.Session,
     *,
-    install_args: Sequence[str],
+    install_args: Sequence[str] = (),
     run_args: Sequence[str] = (),
     extras: Sequence[str] = (),
 ) -> None:
@@ -147,7 +147,7 @@ def build(session: nox.Session) -> None:
     """
 
     session.install("build")
-    session.run("python", "-m", "build", **session.posargs)
+    session.run("python", "-m", "build", *session.posargs)
 
 
 EXAMPLES = ["c", "abi3", "pybind11", "nanobind", "swig", "cython"]
@@ -204,7 +204,7 @@ def downstream(session: nox.Session) -> None:
             "clone",
             args.project,
             *remaining,
-            proj_dir,
+            str(proj_dir),
             "--recurse-submodules",
             external=True,
         )

pyproject.toml

@@ -136,7 +136,7 @@ markers = [
 
 
 [tool.mypy]
-files = ["src", "tests"]
+files = ["src", "tests", "noxfile.py"]
 mypy_path = ["$MYPY_CONFIG_FILE_DIR/src"]
 python_version = "3.7"
 warn_unused_configs = true