Agent skill
testing-hooks
Teaches testing custom hooks in React 19 using renderHook from React Testing Library. Use when testing custom hooks or hook behavior.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/testing/testing-hooks-djankies-claude-configs-ac71fe21
SKILL.md
Testing Custom Hooks
Basic Hook Testing
For hook testing with Vitest fixtures and describe/test patterns, use vitest-4/skills/writing-vitest-tests which covers test structure and fixture patterns.
import { renderHook, act } from '@testing-library/react';
import { useCounter } from './useCounter';
test('useCounter increments', () => {
const { result } = renderHook(() => useCounter());
expect(result.current.count).toBe(0);
act(() => {
result.current.increment();
});
expect(result.current.count).toBe(1);
});
Testing Hooks with Props
import { renderHook } from '@testing-library/react';
import { useUser } from './useUser';
test('useUser fetches user data', async () => {
const { result } = renderHook(() => useUser('123'));
expect(result.current.loading).toBe(true);
await waitFor(() => {
expect(result.current.loading).toBe(false);
});
expect(result.current.user).toEqual({ id: '123', name: 'Alice' });
});
Testing Hooks with Context
import { renderHook } from '@testing-library/react';
import { ThemeProvider } from './ThemeContext';
import { useTheme } from './useTheme';
test('useTheme returns theme from context', () => {
const wrapper = ({ children }) => (
<ThemeProvider value="dark">{children}</ThemeProvider>
);
const { result } = renderHook(() => useTheme(), { wrapper });
expect(result.current.theme).toBe('dark');
});
For comprehensive hook testing patterns, see: React Testing Library documentation.
References
- @vitest-4/skills/writing-vitest-tests - Fixture patterns and setup
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