Effect Testing Skill

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

Effect Source Reference

The Effect v4 source is available at ~/.local/share/effect-solutions/effect/. Browse and read files there directly to look up APIs, types, and implementations.

Reference this for:

• Testing utilities: packages/effect/src/Testing.ts
• @effect/vitest source: packages/vitest/
• Migration guide: MIGRATION.md
• Effect source: packages/effect/src/

Framework Selection

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