How do I: test code that calls external web services

With the current test framework and it’s limitations it can sometimes be hard to find a way to test your code, this gets even worse when external web services are called.
I’ve seen a number of (bad) workarounds in the last few months varying from calling a nonexistent endpoint to a self-hosted web service to test against.
Of course those workarounds do their job but we can do better than that, and let’s not forget tests must be independent of external components!

Ideally we would simply mock this web service call and return some data we can test against, but not in (C/)AL right?
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