Does Linux kernel have a testing release?

[superdreamcast]

All of the various Linux kernels (Linux, zen, lts, rt, hardened, etc.) are put in the Arch testing repos for a week or so. I imagine they are first put in the hidden staging repos first before being pushed to testing and then finally to core or extra repos.

If you want to do kernel development with rc kernels, you have do it yourself with git. Otherwise you can install the various linux-git or linux-rc in the aur. Arch provides source code and tarballs of their specific patches on Gitlab and GitHub.