Interview Strategy · interview question

If you wrote a test around mock answer quality, what should the test prove first?

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Question: Why did you choose FastAPI here?
Answer: because the team needed typed request models, clear validation, and a small service boundary more than raw framework novelty.

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

Answer and explanation

Correct answer

C. 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 mock answer quality, what should the test prove first?

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