I too have never worked with testers, but I'd think a big part of any working relationship like this is about establishing things each finds interesting about the other.
As a developer it's easy to say you might want the testers to gain an appreciation for automation and workflow efficiency gains, but showing an interest in their expertise and struggle seems like it could be point zero.
Yeah, I started with 1:1s with the testers to see what they thought their role was, where they wanted to go, and how I could help. I'm starting to give their ideal approach a go. While it does seem a touch slower for me, I think the positivity of the relationship will pay dividends.