principle-test-behavior-not-implementation

Apply when you write, change, or keep a test. Call the code as its users do and assert the exact result they see. Rewrite or delete a test that would pass if every imported function returned undefined.

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Strengthen one test's behavioral assertions

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Use principle-test-behavior-not-implementation to review the test I provide alongside its subject code. Identify whether it could pass with an incorrect result, then propose one concrete input and an assertion of the exact user-visible output or effect. Show the proposed test without changing files.

Required inputs

One existing test and the code it exercises.
The expected behavior for a concrete input.

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