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System Design · interview question

If you wrote a test around choosing the model, what should the test prove first?

Multiple choiceHardchapter-15-curatedpremiumsystem-designchoosing-the-model
python
def choose_execution_model(io_heavy: bool, cpu_heavy: bool) -> str:
    if io_heavy:
        return "asyncio or threads"
    if cpu_heavy:
        return "processes"
    return "simple synchronous code"
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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