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A bug appears around parameterized tests. What is the strongest first debugging move?

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

A. 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. Packing unrelated scenarios into one parameterized test can hide what the rule really is.

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