hard20 pts · first answer countsmockingcontract-testing

Green tests, broken production

Frontend tests mock every API call and stay green, but production broke when the backend renamed a field. What change best prevents this class of failure?

A.Stop mocking and test only against shared stagingB.Keep the mocks but generate or verify them against the real API contract, for example with contract tests or an OpenAPI schema checkC.Add more snapshot tests of the UID.Ask backend developers to never rename fields

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Green tests, broken production

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