[chalmerlowe]

Summary

Temporarily pin pytest<9.2 in the noxfile.py configuration of the 13 handwritten packages affected by the pytest 9.2.0 release.

Context

Upstream pytest 9.2.0 (released on October 27, 2026) changed warning filter initialization so that filterwarnings = error is applied before pytest_configure plugin hooks run, and removed the private FixtureManager._arg2fixturedefs attribute used by pytest-asyncio==0.21.2.

Pinning pytest<9.2 in the affected handwritten packages unblocks CI and current release pull requests (such as #18876). A follow-up effort will address pytest 9.2 compatibility across these packages cleanly.

Why These 13 Handwritten Packages Are Pinned

All 13 packages configure filterwarnings = error in pytest.ini or pyproject.toml and fall into two categories:

1. Direct pytest-asyncio usage (10 packages): db-dtypes, google-api-core, google-auth-httplib2, google-cloud-dns, google-cloud-documentai-toolbox, google-cloud-error-reporting, google-cloud-firestore (also pins pytest-asyncio==0.21.2), google-cloud-logging, google-cloud-pubsub, and google-cloud-runtimeconfig. Each installs pytest-asyncio directly in its own noxfile.py alongside filterwarnings = error, causing pytest 9.2.0 to abort during startup when pytest-asyncio emits PytestDeprecationWarning for asyncio_default_fixture_loop_scope.

2. Shared CI virtualenv inheritance (3 packages): google-cloud-core, google-cloud-testutils, and proto-plus. Although these three do not install pytest-asyncio in their own noxfile.py, our GitHub Actions test workflows reuse a shared Nox virtualenv directory (NOX_ENVDIR=/tmp/shared_nox_envs) across all packages in the same CI shard. When earlier packages in a shard install pytest-asyncio into that shared environment it will trigger the filterwarnings = error startup failure when these three packages run.

[gemini-code-assist]

Code Review

This pull request updates the 'noxfile.py' configuration files across multiple packages to pin the 'pytest' dependency to versions below 9.2 ('pytest<9.2'). This change affects unit tests, system tests, prerelease sessions, and core dependency installations. Additionally, a minor formatting adjustment was made in 'packages/google-cloud-testutils/noxfile.py' to add an empty line before imports. There are no review comments, and I have no feedback to provide.