We have nowhere to test squads out

Over the last few weeks I've had two new squads go through the build process, with nowhere to test them out at relic levels

I've thought about making a change to one of my staple squads, but hesitate because I have nowhere to test it out at relic levels

I've recently theorycrafted a couple of things, but have nowhere to effectively try them out 

Whenever players used to complain that this game doesn't have "test dummies", others would always point them to the Galactic Challenges, but those have been taken from us

Where do we test things now?