Just quit and move on. If they're that petty on what is industry standard, then they're going to be petty on other things as well. Also if the other developer

Just quit and move on. If they're that petty on what is industry standard, then they're going to be petty on other things as well. Also if the other developers are okay with not writing unit tests too, then it's a shit job. But if you want to try, measure downtime or loss of productivity. Then convert it to dollars assuming average rate of dollars in the industry. And put the dollars in parenthesis ($10,000) to denote the loss. Write an email, forward it up the chain. Then when the next outage happens, gently point out that email, and be prepared to offer solutions.