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They are limited to their own organisation.

https://www.pivotaltracker.com/story/show/76712400
> Well, if you don't stub it's a balancing act between confidence and having to change tests in two places if/when you change the code.

Totally. I think we get adequate confidence from the solid unit tests and two baseline checks that the happy paths (can see and can't see) are satisfied.

There will always be some weird and wonderful way to cheat the tests. Two important questions I like to ask are: How likely is this to happen?; and what is the risk if it does? If the answers are: "Not very"; and "low", then I reckon it's best to keep the tests as simple and as robust as possible.