Now that #70 was closed as fixed, we should be all set for gating on side-tags, so I've done a little testing and created this update:

https://bodhi.fedoraproject.org/updates/FEDORA-2019-c10011d6bf
For which the tests are failing
https://jenkins-continuous-infra.apps.ci.centos.org/blue/organizations/jenkins/fedora-rawhide-build-pipeline/detail/fedora-rawhide-build-pipeline/7875/pipeline/
but not in the way I expected:

[2019-12-10T15:27:27.181Z] + koji download-task --arch=x86_64 --arch=src --arch=noarch --logs 1421210
[2019-12-10T15:27:27.438Z] No files for download found.

I tracked down the notification sent about the update being ready for testing:
https://apps.fedoraproject.org/datagrepper/id?id=2019-d489c158-5aef-41c4-91d8-1ba8f38c7c3c&is_raw=true&size=extra-large

It looks like the pipeline is mixing up id and task_id.