Question 1
AdvancedMethods and Techniques for the Testing of AI-Based Systems · Metamorphic Testing Application
A financial institution has developed an AI model to assess loan application risk. The model is a deep neural network, making it a "black box" where the logic for a specific decision is not easily explainable. The test team faces a significant test oracle problem, as calculating the "correct" risk score for a new applicant profile is infeasible. They decide to use Metamorphic Testing (MT). Which of the following represents the MOST effective Metamorphic Relation (MR) for testing the logical consistency of this loan risk model?
Answer and explanation
Correct answer: C
This is the most effective Metamorphic Relation because it tests a fundamental logical property of a loan risk model without needing a precise expected output. The property is that, all other factors being equal, a higher income should not increase financial risk. This allows the team to verify the model's logical consistency even when the exact risk score calculation is unknown. The other options are less effective: a tiny income change may not trigger a score change, duplicating the test case only checks for determinism, and assuming proportionality is not a guaranteed property.
