I'm not sure if I should be proud of this or not, but once I had some pretty critical field values in a Excel spreadsheet that I had to make sure were compatibl

I'm not sure if I should be proud of this or not, but once I had some pretty critical field values in a Excel spreadsheet that I had to make sure were compatible with my code. I ended up adding some derived formulas in a new locked sheet within the file, committed the XLSX to Git and then created a JUnit test to make sure everything was in sync. In a nutshell, the XLSX became the source of truth