Core Collections · interview question

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

Multiple choiceEasychapter-3-curatedpremiumcore-collectionslists

python

skus = ["SKU-1", "SKU-2", "SKU-3"]
print(skus[0], len(skus))

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 lists.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep lists implicit so the script stays short and hope the next engineer infers the rule.

Answer and explanation

Correct answer

A. 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.

Test yourself on Core Collections

A free test with instant, explained results. No account needed.

Start free test

All Core Collections questions →

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

Correct answer

Why

More Core Collections questions