Component Testing

Component Testing Skill

Purpose

This skill provides React component testing conventions using Testing Library. Component tests verify rendering, user interactions, and accessibility of React components.

Activation

This skill activates when:

• Creating or modifying files in tests/components/
• Testing React components (.tsx files)
• Working with Testing Library
• Testing user interactions with userEvent

File Patterns

• tests/components/**/*.test.tsx

Workflow

1. Detect component test work (file path contains tests/components/)
2. Load references/Component-Testing-Conventions.md
3. Also load testing-base skill for shared conventions
4. Apply component test patterns with Testing Library
5. Ensure accessibility-first query usage

Key Patterns (REQUIRED)

Custom Render

• ALWAYS use customRender from tests/setup/test-utils.tsx
• Returns { user, ...renderResult } with pre-configured userEvent
• Includes all providers (theme, clerk, etc.)

Testing Library Queries

• Prefer getByRole for accessibility
• Use getByTestId with namespace pattern (ui-, feature-, form-*)
• Use getByText, getByLabelText for content
• Use queryBy* for assertions on missing elements

User Interactions

• Use user from customRender return (pre-configured userEvent)
• Always await user interactions
• Test real user behaviors, not implementation details

Pre-Mocked Dependencies

• Clerk, Next.js navigation, sonner, next-themes are pre-mocked
• Mock server actions with vi.mock()

References

• references/Component-Testing-Conventions.md - Complete component testing conventions