Subtests in pytest 9.0.0+

pytest 9.0.0 was released on November 8th 2025. I just got around to looking at the release notes and the biggest new feature is subtests , previously available as the separate pytest-subtests plugin. I copied the documentation into Claude Code and told it to find a good place to try them in the Datasette test suite. It suggested tests/test_docs.py , which currently make heavy use of the…