next.js/test/integration/api-body-parser/test/index.test.ts

/* eslint-env jest */

import { join } from 'path'
import {
  killApp,
  findPort,
  launchApp,
  fetchViaHTTP,
  initNextServerScript,
} from 'next-test-utils'
import getPort from 'get-port'

const appDir = join(__dirname, '../')
let appPort: number

let app
let server

const context: { appPort?: number } = {}

function runTests() {
  it('should parse JSON body', async () => {
    appPort = await findPort()
    app = await launchApp(appDir, appPort, {})
    const data = await makeRequest()
    expect(data).toEqual([{ title: 'Nextjs' }])
    await killApp(app)
  })

  it('should not throw if request body is already parsed in custom middleware', async () => {
    await startServer()
    const data = await makeRequest()
    expect(data).toEqual([{ title: 'Nextjs' }])
    await killApp(server)
  })

  it("should not throw if request's content-type is invalid", async () => {
    await startServer()
    const status = await makeRequestWithInvalidContentType()
    expect(status).toBe(200)
    await killApp(server)
  })
}

async function makeRequest() {
  const data = await fetchViaHTTP(appPort, '/api', null, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json; charset=utf-8',
    },
    body: JSON.stringify([{ title: 'Nextjs' }]),
  }).then((res) => res.ok && res.json())

  return data
}

async function makeRequestWithInvalidContentType() {
  const status = await fetchViaHTTP(appPort, '/api', null, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json;',
    },
    body: JSON.stringify([{ title: 'Nextjs' }]),
  }).then((res) => res.status)

  return status
}

const startServer = async (optEnv = {}, opts?: any) => {
  const scriptPath = join(appDir, 'server.js')
  context.appPort = appPort = await getPort()
  const env = Object.assign(
    { ...process.env },
    { PORT: `${appPort}`, CUSTOM_SERVER: 'true' },
    optEnv
  )

  server = await initNextServerScript(
    scriptPath,
    /ready on/i,
    env,
    /ReferenceError: options is not defined/,
    opts
  )
}

runTests()