Recall practical unit-test case types for logic, boundaries, errors, and state changes.
Middle vs edge Where do boundary tests look first? Boundaries pressure the exact comparison the code is likely to get wrong. Logic check What does a logic check verify? The code follows the right path and calculation for a known valid input. Example: a standard CSV row maps to the expected customer object. Objection We tested a normal import, so the parser works. Use when only happy-path unit tests exist. Your line The normal import proves the middle. Let's add one test at the limit and one malformed row so we know how the edges behave. Happy-path confidence can hide…
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