[wry_discontent]

I see a lot of times people (read: me) are lazy and make a mock that does not have anywhere near the behavior of the original. It's more like a very partial stub. I will mock an api with 20 possible calls with the 2 that I use. Unsurprisingly, this mock is closely tied to the current implementation.

[bccdee]

I think making narrow use-case-specific test doubles is often better than a big shared one. You can even wrap the API with an interface that only exposes the methods you need.