PgQueuer turns PostgreSQL into a background job queue using LISTEN/NOTIFY and FOR UPDATE SKIP LOCKED. v0.26.0 adds an in-memory adapter so you can run the same code in tests and CI without a database. Internally it's now built on port protocols, so you can swap the persistence layer entirely.
EDIT; HN trims the full url to readme about in-memory https://github.com/janbjorge/pgqueuer?tab=readme-ov-file#in-...