Type Hints · interview question

If you wrote a test around function type hints, what should the test prove first?

Multiple choiceEasychapter-10-curatedpremiumtype-hintsfunction-type-hints

python

def shipping_fee(subtotal: float) -> float:
    return 0 if subtotal >= 100 else 6.5

Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep function type hints implicit so the script stays short and hope the next engineer infers the rule.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 function type hints.

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 function type hints, what should the test prove first?

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