The following bug leads to this question: https://github.com/QubesOS/qubes-issues/issues/3810
Is one only "on testing" when one has enabled any of the 3 testing repos (https://www.qubes-os.org/doc/software-update-dom0/#testing-repositories)? Because I checked the "enabled" booleans in /etc/yum.repos.d/qubes-dom0.repo and they are all set to FALSE except of course for "qubes-dom0-current".
And I only remember doing updates using the GUI (I suppose one does not end up "on testing" like that).
Is there any other way one can end up "on testing" without even knowing?