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();
  });