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    Nice example, that demonstrates flaws of Unit testing. If operations are tested in isolation, a bug in order of operations will go unnoticed. Commented Mar 29, 2024 at 6:08
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    @Basilevs except that isn't a flaw with Unit Tests. That's a flaw with Solitary Tests. Commented Mar 29, 2024 at 13:41
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    Even with sociable test, if you follow test pyramid and reduce the test count for expression calculation (because that is a more of an integration test), you will have the same problem, Commented Mar 29, 2024 at 14:16
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    Meanwhile, system tests for an calculator are orders of magnitude easier to write than unit tests. Commented Mar 29, 2024 at 14:20
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    @Basilevs Sure, writing crapy tests is easier. But reliable tests are easier to use. Whose time are you going to respect? Commented Mar 31, 2024 at 22:46