Testing · interview question

If you wrote a test around tmp_path and file tests, what should the test prove first?

Multiple choiceHardchapter-9-curatedpremiumtestingtmp-path-and-file-tests

python

def test_writes_report(tmp_path) -> None:
    target = tmp_path / "report.json"
    target.write_text("{}", encoding="utf-8")
    assert target.exists()

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

Answer and explanation

Correct answer

C. 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 tmp_path and file tests, what should the test prove first?

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