A simple contract that allows you to perform stateful invariant tests without changing global state
When you're doing tests and don't want to track their side effects into the global state
You can use this abstract contract to perform the test and then revert all state changes
This way you can keep the "Story" simple while testing complex behavior
Make your contract inherit CallTestAndUndo
Edit the function you want to test to require it being called by this
Use _doTestAndReturnResult to call the function (use encodeCall)
See testDemoCal for a quick demo