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

Multiple choiceMediumchapter-9-curatedpremiumtestingparameterized-tests
python
import pytest

@pytest.mark.parametrize("subtotal,expected", [(50, 6.5), (120, 0)])
def test_shipping_fee(subtotal: float, expected: float) -> None:
    assert shipping_fee(subtotal) == expected
Choose one answer
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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