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There is no such thing as a superfluous test. You are testing against unknown unknowns. Against the far future. Against other people. Etc. You should never make any assumptions about what needs testing and what doesn't.
The return-on-investment of a unit test only goes up as a function of time elapsed and number of changes made. For a long-running project, it's the most valuable code you will ever write.
This is only true if the unit tests don't need to change as the product evolves, which is generally false.
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