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- You certainly can (and will more often than not) add new behaviour without changing the interface. I think what you mean is add new behaviour without changing the return value for a given input, implying an impure function - they can only be tested by asserting on their side effects. Then you're left with either or both of test doubles (so you can assert on the interactions with collaborators) or real behaviour - the latter leaves you freer to refactor, but comes at a cost of test complexity and speed.jonrsharpe– jonrsharpe2022-12-30 14:50:23 +00:00Commented Dec 30, 2022 at 14:50
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