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You need tests for all part of the functionality you care about. I write tests for making sure that what is persisted is what we get back. Just the other day I

• osigurdson 2y ago
  Not suggesting that testing other things isn't useful but not as straightforward and not as obviously beneficial as pure function testing. It is easy to just dogmatically pile on tests but they may not be helpful.
  • Ma8ee 2y ago
    I’d say, as beneficial. But as you say, not as straightforward. One if the reasons functional programming is popular is because it makes it easier to test, but it’s not that other code needs less testing.