old_contents: import test from 'ava'
  import { resolve } from 'path'
  import { Nuxt, Builder, Utils } from '..'
  import { uniq } from 'lodash'
  
  const port = 4008
  let nuxt = null
  
  // Utils
  const range = n => [...Array(n).keys()]
  const FOOBAR_REGEX = /<foobar>([\s\S]*)<\/foobar>/
  const match = (regex, text) => (regex.exec(text) || [])[1]
  
  // Init nuxt.js and create server listening on localhost:4000
  test.before('Init Nuxt.js', async t => {
    const options = {
      rootDir: resolve(__dirname, 'fixtures/ssr'),
      dev: false,
      render: {
        resourceHints: false
      },
      build: {
        extractCSS: true
      }
    }
    nuxt = new Nuxt(options)
    await new Builder(nuxt).build()
    await nuxt.listen(port, 'localhost')
  })
  
  // == Uniq Test ==
  // The idea behind is pages using a shared nextId() which retuns an increamenting id
  // So all responses should strictly be different and length of unique responses should equal to responses
  // We strictly compare <foorbar>{id}</foorbar> section
  // Because other response parts such as window.__NUXT may be different resulting false positive passes.
  const uniqueTest = async (t, url) => {
    let results = []
  
    await Utils.parallel(range(20), async () => {
      let { html } = await nuxt.renderRoute(url)
      let foobar = match(FOOBAR_REGEX, html)
      results.push(parseInt(foobar))
    })
  
    let isUnique = uniq(results).length === results.length
  
    if (!isUnique) {
      /* eslint-disable no-console */
      console.log(url + '\n' + results.join(', ') + '\n')
    }
  
    t.true(isUnique)
  
    return results
  }
  
  test('unique responses with data()', async t => {
    await uniqueTest(t, '/data')
  })
  
  test('unique responses with component', async t => {
    await uniqueTest(t, '/component')
  })
  
  test('unique responses with async components', async t => {
    await uniqueTest(t, '/asyncComponent')
  })
  
  test('unique responses with asyncData()', async t => {
    await uniqueTest(t, '/asyncData')
  })
  
  test('unique responses with store initial state', async t => {
    await uniqueTest(t, '/store')
  })
  
  test('unique responses with nuxtServerInit', async t => {
    await uniqueTest(t, '/store?onServerInit=1')
  })
  
  test('unique responses with fetch', async t => {
    await uniqueTest(t, '/fetch')
  })
  
  // Close server and ask nuxt to stop listening to file changes
  test.after('Closing server and nuxt.js', t => {
    nuxt.close()
  })
  
new_contents: import test from 'ava'
  import { resolve } from 'path'
  import { Nuxt, Builder, Utils } from '..'
  import { uniq } from 'lodash'
  import rp from 'request-promise-native'
  
  const port = 4008
  let nuxt = null
  
  // Utils
  const range = n => [...Array(n).keys()]
  const FOOBAR_REGEX = /<foobar>([\s\S]*)<\/foobar>/
  const match = (regex, text) => (regex.exec(text) || [])[1]
  
  const url = (route) => 'http://localhost:' + port + route
  
  // Init nuxt.js and create server listening on localhost:4000
  test.before('Init Nuxt.js', async t => {
    const options = {
      rootDir: resolve(__dirname, 'fixtures/ssr'),
      dev: false,
      render: {
        resourceHints: false
      },
      build: {
        extractCSS: true
      }
    }
    nuxt = new Nuxt(options)
    await new Builder(nuxt).build()
    await nuxt.listen(port, 'localhost')
  })
  
  // == Uniq Test ==
  // The idea behind is pages using a shared nextId() which returns an incrementing id
  // So all responses should strictly be different and length of unique responses should equal to responses
  // We strictly compare <foorbar>{id}</foorbar> section
  // Because other response parts such as window.__NUXT may be different resulting false positive passes.
  const uniqueTest = async (t, url) => {
    let results = []
  
    await Utils.parallel(range(20), async () => {
      let { html } = await nuxt.renderRoute(url)
      let foobar = match(FOOBAR_REGEX, html)
      results.push(parseInt(foobar))
    })
  
    let isUnique = uniq(results).length === results.length
  
    if (!isUnique) {
      /* eslint-disable no-console */
      console.log(url + '\n' + results.join(', ') + '\n')
    }
  
    t.true(isUnique)
  
    return results
  }
  
  test('unique responses with data()', async t => {
    await uniqueTest(t, '/data')
  })
  
  test('unique responses with component', async t => {
    await uniqueTest(t, '/component')
  })
  
  test('unique responses with async components', async t => {
    await uniqueTest(t, '/asyncComponent')
  })
  
  test('unique responses with asyncData()', async t => {
    await uniqueTest(t, '/asyncData')
  })
  
  test('unique responses with store initial state', async t => {
    await uniqueTest(t, '/store')
  })
  
  test('unique responses with nuxtServerInit', async t => {
    await uniqueTest(t, '/store?onServerInit=1')
  })
  
  test('unique responses with fetch', async t => {
    await uniqueTest(t, '/fetch')
  })
  
  // == Stress Test ==
  // The idea of this test is to ensure there is no memory or data leak during SSR requests
  // Or pending promises/sockets and function calls.
  // Making 16K requests by default
  // Related issue: https://github.com/nuxt/nuxt.js/issues/1354
  const stressTest = async (t, _url, concurrency = 64, steps = 256) => {
    let statusCodes = { }
  
    await Utils.sequence(range(steps), async () => {
      await Utils.parallel(range(concurrency), async () => {
        let response = await rp(url(_url), { resolveWithFullResponse: true })
        // Status Code
        let code = response.statusCode
        if (!statusCodes[code]) {
          statusCodes[code] = 0
        }
        statusCodes[code]++
      })
    })
  
    t.is(statusCodes[200], concurrency * steps)
  }
  
  test('stress test with asyncData', async t => {
    await stressTest(t, '/asyncData')
  })
  
  // Close server and ask nuxt to stop listening to file changes
  test.after('Closing server and nuxt.js', t => {
    nuxt.close()
  })
  
subject: add stress test for asyncData