A municipal water-meter portal draft from an LLM lists an acceptance criterion that “a renter may reset a landlord’s leak alert.” That rule is nowhere in the user story. Which defect is this?
Select an answer to reveal the explanation.
Short Explanation
It is like writing exam questions for a chapter that was never assigned. The model invented an acceptance criterion, so any tests built on it chase a rule that does not exist.
Full Explanation
A testing-specific form of hallucination is proposing fictitious or non-existent acceptance criteria. The output can look like valid AC wording while having no basis in the story or requirements. Reviewers should reject such criteria before designing cases around them.