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It appear functions like `ec2.LookupVpc` don’t perform lookups in [unit] tests. Are there any examples of mocking them out?

I don't believe we have an example test that mocks out a get call. You can see the implementation of the mocks here: <https://github.com/pulumi/pulumi/blob/master/sdk/go/pulumi/mocks.go>

any get/lookup function will ultimately call ReadResource wich calls NewResource in turn.

We do have an internal test in the Go SDK that tests ReadResource which may be useful reference: <https://github.com/pulumi/pulumi/blob/master/sdk/go/pulumi/run_test.go#L155>