Wow 😲
It's not that hard to setup GitHub or GitLab to make sure all the unit tests run for each PR.
If you use something else for version control, check if they offer a similar CI feature. If not, setup Jenkins.
I'm an SRE at a big tech company, so part of my job is to make sure CI infrastructure is readily available to our Dev partners. But I've worked at smaller companies before (10 or less SWEs) and even they had a Jenkins instance.
This is a bright red flag to me. If I worked for a company that didn't have CI, the first thing I would do is set it up. If I wasn't allowed to take the time required to do that, I would quit...