Create effective mocks and stubs
Isolate tests from external dependencies
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I need to mock [EXTERNAL_SERVICE: third-party API, database, file system] for [MODULE_NAME] tests. Show me how to create mocks with [Jest/Vitest] that: simulate normal and error responses, are reusable across tests, make no real network calls, and verify that the code properly calls the right methods with the right arguments.
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Pour des mocks réutilisables, encapsule chaque simulation dans une fonction factory exportable (ex: `mockFetchSuccess(data)`). Utilise `vi.mock` (ou `jest.mock`) avec une factory pour remplacer tout le module. Ajoute `beforeEach` avec `vi.clearAllMocks()` pour isoler les tests. Vérifie les appels avec `.toHaveBeenCalledWith(exactArgs)`. Cela évite la duplication et assure la fiabilité.
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