The GCP provider accepts a number of custom endpoint arguments. Where can I find information on how to use these? https://www.pulumi.com/docs/reference/pkg/gcp/provider/

Here is a list of all endpoints provided by GCP. https://developers.google.com/apis-explorer You could probably (I've not done it myself) provide a custom endpoint if you emulate GCP services locally, like the pub/sub emulator for example: https://cloud.google.com/pubsub/docs/emulator

Thx. I am thinking of using a service virtualisation tool like pact.io to replace the Real GCP endpoints with virtual versions and run Pulumi test suites against these virtual endpoints with predefined request/response pairs. Still need to think through if such a setup adds value in light of QA and continuous delivery