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You’ll want the mock to return the same ‘shape’ as what the function actually returns. The `token` refers to the function being called. For example, if you look at <https://github.com/pulumi/pulumi-aws/blob/master/sdk/python/pulumi_aws/acm/get_certificate.py#L103>

You’ll see
```    __ret__ = pulumi.runtime.invoke('aws:acm/getCertificate:getCertificate', __args__, opts=opts).value```

And `aws:acm/getCertificate:getCertificate` is what `token` will be when you call `pulumi_aws.acm.get_certificate(...)`

So typically, you’d just return `{}` for most functions if you don’t care about doing anything with them in your tests. If you do, you can compare against `token` and then decide what relevant thing you want to return for your testing.