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Idempotency in API design is important for testing because
ATests can bypass authentication entirely
BTests can safely retry failed requests
CTests will never need to wait for results
DTests can skip checking response codes
Answer & Solution
Correct answer: B. Tests can safely retry failed requests
Idempotent operations (PUT, DELETE, GET) yield the same end state on repeated calls. Tests retrying a transient failure should not duplicate side effects. POST is not idempotent unless designed with an idempotency-key header.
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