vitest-mocking

SKILL.md

| Spy | Record calls, verify interactions | No (uses real code) | | Mock | Replace module entirely | Yes | | Stub | Return canned responses | Yes | | Fake | Working but simplified impl | Yes |

Use spy when: Verifying a function was called correctly while keeping real behavior

Use mock when: Replacing external dependencies (network, database, third-party modules)

Vitest mocking patterns and test double strategies. Use when writing tests that need mocks, spies, stubs, or fakes. Triggers include: mocking modules, stubbing globals (fetch, Date, timers), testing composables, mocking imports (default/named), creating test doubles, replacing dependencies, verifying mock calls, cleaning up mocks, or any question about "how do I mock X in Vitest". Also use when reviewing tests for proper mocking practices. Source: alexanderop/workouttracker.

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