Drill 27: Change a value — Testing HTTP handlers

import assert from 'node:assert/strict'
import { test } from 'node:test'
import { makeUserHandler, type User, type UserStore } from './handler'

const fakeStore: UserStore = {
  async findById(id: string): Promise<User | null> {
    return id === '1' ? { id: '1', name: 'Ada' } : null
  },
}

test('returns the user when it exists', async () => {
  const handler = makeUserHandler(fakeStore)
  const result = await handler('1')
  assert.equal(result.status, 200)
  assert.deepEqual(result.body, { id: '1', name: 'Ada' })
})

test('returns 404 when the user is missing', async () => {
  const handler = makeUserHandler(fakeStore)
  const result = await handler('2')
  assert.equal(result.status, 404)
})