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Functions · interview question

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

Multiple choiceMediumchapter-2-curatedpremiumfunctionsfunction-extraction
python
def calculate_subtotal(unit_price: float, quantity: int) -> float:
    return unit_price * quantity


def shipping_fee(subtotal: float) -> float:
    return 0 if subtotal >= 100 else 6.50
Choose one answer
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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