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What's the best way to test dynamic/custom resources?

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/>