With kernel 5.6 available have removed testing version.
If you want to test out kernel 5.6 early then I may have something for you. Built an iso with testing and community-testing enabled. Am uploading to a new folder in files on Sourceforge named ArchBang-Unstable-Testing-Bets-WIP. As folder name suggests its very very beta so I would not recommend installing on a daily working system, rather use it for testing, Virtual Machine etc…
Should you wish to install it, very much at your own risk… cannot support you if things break and they will 😉 Of course you can install it then disable testing repos …
The power of Arch is in your hands