grade_label(score) accepts integer scores from 0 through 100. Which supplied score is a boundary of that allowed domain?

• score = 50
• score = 0
• score = 70

For the documented split_bill contract, which plan covers ordinary inputs, edges of its allowed domain and its specified rejected inputs?

• Only ordinary valid calls, repeated with different totals
• Ordinary calls, relevant boundaries and expected errors
• Only rejected calls, repeated with different invalid inputs

A unit-test suite can run its checks automatically without a person clicking through application screens.

A test asserts split_bill(18, 3) == 6. The function is changed from division to multiplication and now returns 54 for that call. What should this assertion do?

• Pass because the function still returned a numeric result
• Fail because 54 differs from the expected result 6
• Pass because the expected value must follow the new code

split_bill(45, 5) should return 9 but returns 8. Which failure message accurately identifies this broken promise?

• Expected 9; got 8 for split_bill(45, 5)
• Expected 8; got 9 for split_bill(45, 5)
• Expected 9; got 8 for split_bill(40, 5)

A test calculates its expected result by copying the function's implementation logic. What correctness risk does this create?

• Matching computations rule out errors in the expected value
• Both computations may share the same undetected mistake
• Repeating the computation checks inputs never supplied

shipping_weight([]) must return 0. Every test in the passing suite supplies a nonempty list. Users find that empty input crashes. Which coverage gap is established by these stated tests?

• An empty-list test uses an incorrect expected result
• An empty-list test checks only the result's data type
• No test checks the required empty-list behaviour

mean(values) is specified to raise ValueError for an empty list. check is a unittest.TestCase instance. Which test checks that specified error?

• Use assertRaises(ValueError) around mean([])
• Use assertRaises(IndexError) around mean([])
• Assert that mean([]) returns zero rather than raising an exception