It's fairly limited right now to testing single blocks in the editor. We recently added support for Git-based development to address testing. The idea there is

It's fairly limited right now to testing single blocks in the editor. We recently added support for Git-based development to address testing. The idea there is that each block is just a chunk of code living in a Git repo, so you can use whatever testing tools you'd like to. It's actually pretty slick -- it's bidirectional. You can use Git to make a commit, like normal, and then refresh the editor to see it. And you can make also changes in the editor and it will commit + push to Git. If you want to play with that, I can share details on how to enable it (it's fairly hidden in the UI atm). In terms of testing workflows together as a chain, that's still TBD. It is something that we'd like to ship eventually though. Along with staging environments and canary deployments. On our immediate roadmap is to get the core of the tool open-sourced so that people can start playing with it outside of our hosted platform. We have it gated behind a credit-card form right now to fight fraud and because of some technical limitations.