No matter how you like to participate in developer communities, Pulumi wants to meet you there. If you want to meet other Pulumi users to share use-cases and best practices, contribute code or documentation, see us at an event, or just tell a story about something cool you did with Pulumi, you are part of our community.

Pulumi Community

Integration tests IMO.
Or are you looking for some mock?

I'm building a resource lib and wanted to test it automatically.

Right now I'm simply coding as I go, but I thought some tests would be nice, to make sure things aren't falling apart later

For pulumi resources there isn't much more you can test than this (AFAIK)
<https://www.pulumi.com/docs/guides/testing/>