Data Cleanup · interview question

If you wrote a test around safe output writes, what should the test prove first?

Multiple choiceMediumchapter-4-curatedpremiumdata-cleanupsafe-output-writes

python

from pathlib import Path

target = Path("orders.json")
temp = target.with_suffix(".tmp")
temp.write_text("[]", encoding="utf-8")
temp.replace(target)

Delay clarity until production traffic reveals the edge case and then patch it under pressure.That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.Solve the symptom with comments only and avoid changing the code shape around safe output writes.Keep safe output writes implicit so the script stays short and hope the next engineer infers the rule.

Answer and explanation

Correct answer

B. That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Why

Good tests make the design safer to change because they lock in the meaningful behavior rather than surface-level implementation details.

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If you wrote a test around safe output writes, what should the test prove first?

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