How to do regression testing on complex rule sets?

I'm trying to fully automate processing of our financial statements, including PDFs from banks, investments, utilities, etc. I have a "Drop Here" folder I can drop PDFs into and Hazel runs it through rules to classify the PDF based on content and then rename it using certain conventions, and moves them to a different "Renamed Files" folder.

There are almost 20 rules now, and I expect this to almost double before I'm done. I'm running into some friction points as I'm adding new rules because I need to confirm all the existing rules continue to work correctly. In addition, these financial institutions will periodically change their PDF formats so I need to stay on top of that.

I'd love to set up test area, e.g. "Drop Here TESTING" folder for input and "Renamed Files TESTING" for output. Then I could debug problems in that setting, and once validated, somehow move the updated rules to the "production" configuration. Is there a way to redirect an entire set of rules to work off of a different input folder AND send their output to a different output folder for testing, and then revert later on?

You can copy and paste rules or use rule syncing. As for changing the folder, you could try using the replace folder function.

Ah! Didn't even know about Replace Folder! That's brilliant--thank you