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If you wrote a test around arrange act assert, what should the test prove first?

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. 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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