// fetchUser.ts
export async function fetchUser(id: string) {
  const res = await fetch(`/api/users/${id}`);
  if (!res.ok) throw new Error('Failed');
  return res.json();
}

// fetchUser.test.ts
import { describe, it, expect, vi } from 'vitest'
import { fetchUser } from './fetchUser'

describe('fetchUser', () => {
  it('returns data on 200', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({ ok: true, json: () => ({ id: '1' }) }))
    expect(await fetchUser('1')).toEqual({ id: '1' })
  })

  it('throws on non-200', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({ ok: false }))
    await expect(fetchUser('1')).rejects.toThrow('Failed')
  })
})