AI-Generated API Tests Can Silently Encode Bugs as Expected Behavior

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AI tools like Postman's Postbot can generate API test scripts quickly, but they assert what an API currently returns rather than what it should return according to its specification. If an API has a bug — such as returning 200 OK for an invalid request — the AI will write tests that treat that incorrect behavior as correct, locking the bug in permanently behind passing tests. Developers are advised to review every generated assertion against the spec, not just the live response, to catch this observed-behavior trap. AI test generation also tends to produce only happy-path cases, leaving negative and boundary scenarios — such as missing fields or malformed inputs — largely uncovered without human input. The recommended approach is to use AI for boilerplate and brainstorming, then manually interrogate each assertion and add adversarial test cases to build a trustworthy suite.

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