Effect Testing Skill

This skill provides comprehensive guidance for testing Effect-based applications using @effect/vitest and standard vitest.

Framework Selection

CRITICAL: Choose the correct testing framework based on the code being tested.

Use @effect/vitest for Effect Code

Use @effect/vitest when testing:

• Functions that return Effect<A, E, R>
• Code that uses services and layers
• Time-dependent operations with TestClock
• Asynchronous operations coordinated with Effect
• STM (Software Transactional Memory) operations