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There's some docs about tests and mocks at <https://www.pulumi.com/docs/guides/testing/unit/>

But it looks like your asking how to write a new simple type that is a `Resource`? I think that would just be setting up the mocks as documented above and calling `ctx.RegisterResource("package:module:type", name, args, &amp;resource, opts...)` with your made up resource type.

I found that I needed a struct that embeds pulumi.ResourceState or pulumi.CustomResourceState in order to get a struct that adheres to the Resource interface. In addition to what you mentioned, the registration.