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Interview Strategy · interview question

If you wrote a test around thinking aloud through code, what should the test prove first?

Multiple choiceMediumchapter-20-curatedpremiuminterview-strategythinking-aloud-through-code
python
def running_total(lines: list[int]) -> int:
    total = 0
    for line in lines:
        total += line
    return total
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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