7.1Why AI-Generated Tests Fail

AI-generated tests fail in predictable ways. Understanding these failure modes lets you spot them instantly during review, rather than discovering them later in CI or -- worse -- in production when the test passes despite a real bug.

These failure modes are not random. They emerge from how LLMs work: they predict statistically likely text, not logically correct code. This means they produce patterns that look like tests but do not function as tests.