sysutils/iocage has a RUN_DEPENDS on devel/py-pytest-runner and devel/rcs57, which seems… wrong.
I'm not seeing those in https://github.com/iocage/iocage/blob/master/requirements.txt or here https://github.com/iocage/iocage/blob/master/setup.py
so where are those dependencies coming from?
The dependency on rcs57 is required to have the "merge" command in place (otherwise upgrading <12 jails on a 12-RELEASE jailhost breaks, which is a common upgrade path when upgrading a jailhost from 11 to 12). See bug #240177 and https://svnweb.freebsd.org/ports?view=revision&revision=512299
So this one will stay there for the foreseeable future.
The dependency on py-pytest-runner is less clear - it came in as part of the update to 0.9.8.1 (https://svnweb.freebsd.org/ports/head/sysutils/iocage/Makefile?r1=436928&r2=442376), which was before I maintained the port.
Removing it doesn't seem to have any immediate ill side-effects (build or runtime), but I don't have the time to test it thoroughly at the moment. Maybe Marcelo could shed some light on this. IMHO ideally we would keep it as a build time dependency and have a working test target, but remove the run-time dependency.