Project Tooling · interview question

If you wrote a test around module boundaries, what should the test prove first?

Multiple choiceEasychapter-6-curatedpremiumproject-toolingmodule-boundaries

python

from order_ops.pricing import compute_total
from order_ops.validation import ensure_valid_order

Solve the symptom with comments only and avoid changing the code shape around module boundaries.That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep module boundaries implicit so the script stays short and hope the next engineer infers the rule.

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 module boundaries, what should the test prove first?

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