Following the unit testing at https://www.pulumi.com/docs/guides/testing/unit/ and I am failing to understand how to Mock simple API calls. My IaC has

region = aws.get_region()

as one of the first API calls.

class PulumiMocks(pulumi.runtime.Mocks):
    def new_resource(self, args: pulumi.runtime.MockResourceArgs):
        print("new_resource")
        return [args.name + '_id', args.inputs]

    def call(self, args: pulumi.runtime.MockCallArgs):
        print(f"XXXXX call:")
        return {}

Narrowed down

aws.get_region()

invokes the Mocks

call(self, args: pulumi.runtime.MockCallArgs):

how do I extract that I am calling get_region() and return my Mock values? Maybe I’m missing something? I thought I would be able to add

get_region()

method to the PulumiMocks() class? Any help would be appreciated.

the args.token member will be set to "aws:get_region" (I think, something like that at any rate), then you can just return a dictionary with the return values filled in, something like

{"name": "us-west-2"}