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A bug appears around arrange act assert. What is the strongest first debugging move?

Multiple choiceEasychapter-9-curatedpremiumtestingarrange-act-assert
python
def test_discount_rate() -> None:
    # arrange
    subtotal = 120.0
    # act
    result = discount_rate(True, subtotal)
    # assert
    assert result == 0.15
Choose one answer
Answer and explanation

Correct answer

D. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. When setup and assertions are mixed together, tests become harder to scan and harder to fix.

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