Discover how to build your own, offline "LocalStack" for Google APIs using WireMock and TestContainers. In this post, I will show you how to set up a two-purpose mocking strategy. By writing your JSON mock responses just once, you can reuse them to power automated integration tests and spin up a standalone mock server for local (UI) development. No more production data and sharing of google keys between developers, no more 403 User Rate Limit Exceeded.