Debugging · interview question

If you wrote a test around tracebacks and root cause, what should the test prove first?

Multiple choiceMediumchapter-5-curatedpremiumdebuggingtracebacks-and-root-cause

python

def line_total(price: float, quantity: int) -> float:
    return price * quantity


print(line_total("9.99", 3))

Keep tracebacks and root cause 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 tracebacks and root cause.Delay clarity until production traffic reveals the edge case and then patch it under pressure.

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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If you wrote a test around tracebacks and root cause, what should the test prove first?

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