Method reset

test/engine/test_pool.py:479–483

(conn, rec, state)

        @event.listens_for(p, "reset")
        def reset(conn, rec, state):
            canary.append(
                "reset_"
                f"{'rollback_ok' if state.asyncio_safe else 'no_rollback'}"
            )

        @event.listens_for(p, "checkin")
        def checkin(*arg, **kw):