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Control Flow · interview question

If you wrote a test around guard clauses, what should the test prove first?

Multiple choiceEasychapter-2-curatedpremiumcontrol-flowguard-clauses
python
def validate_line(sku: str, quantity: int) -> None:
    if not sku:
        raise ValueError("sku is required")
    if quantity <= 0:
        raise ValueError("quantity must be positive")
Choose one answer
Answer and explanation

Correct answer

D. 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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