Vitest Unit Test Creation Patterns

"Unit tests verify the smallest parts of your code work correctly."

When to Use This Skill

Use when creating unit tests for:

• React components (including React Three Fiber)
• Zustand stores
• Services and utilities
• ECS components and systems
• Hooks and custom functions

CRITICAL: NEVER CREATE FAKE OR TRIVIAL TESTS. If a test cannot be created with meaningful assertions based on the specs/gdd requirements, DO NOT CREATE A TEST. Instead, report the issue to PM and document the gap in test coverage in the task comments and close the task as completed with observations.

Test File Locations

Pattern: Mirror src/ structure in src/tests/