An eye opening example for me was that I was working with a Ruby/Rails class that was testing various IP configurations [1] and I was able to just copy and paste it into chatgpt and say "write some tests for this".

It wasn't really anything I couldn't have written in a half hour or so but it was so much faster. The real kicker is that by default chatgpt wrote Rspec and I was able to say "rewrite that in minitest" and it worked.

1 - https://wafris.org/ip-lookup