5 questions every unit test must answer

There are 5 questions every unit test must answer. I’ve described them in detail before, so we’ll just skim them this time:

1. What is the unit under test (module, function, class, whatever)?
2. What should it do? (Prose description)
3. What was the actual output?
4. What was the expected output?
5. How do you reproduce the failure?

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