I know that https://en.wikipedia.org/wiki/S2_Spreadsheet?wprov=sfla1 existed since '84 and was in use in disparate parts of the company (I hit the printer division in the summer of '88). IBM was still using mainframe tools, including FORTRAN and APL for engineering work, and we were using BASIC for some testing automation as well as stuff written in assembly (bit banging of parallel ports as GPIO).
Automation was used in testing since the beginning, of course. (Earliest vivid example I have is from a 1956 television commercial.)
Spreadsheets certainly existed. We know that.
What I don't have is any example or testimonial from anyone, earlier than 1988, of using a spreadsheet to DRIVE automation used in testing. I would be surprised if I was the first to have thought of it. I can only say that my team asked around Apple and found no one doing this but our team, at that time.
