test: test build with DLL

packages/@vue/cli-service/__tests__/buildDLL.spec.js

@@ -0,0 +1,62 @@
+jest.setTimeout(30000)
+
+const path = require('path')
+const portfinder = require('portfinder')
+const { createServer } = require('http-server')
+const { defaults } = require('@vue/cli/lib/options')
+const create = require('@vue/cli-test-utils/createTestProject')
+const launchPuppeteer = require('@vue/cli-test-utils/launchPuppeteer')
+
+let server, browser, page
+test('build with DLL', async () => {
+  const project = await create('e2e-build-dll', Object.assign({}, defaults, {
+    router: true,
+    vuex: true
+  }))
+
+  // enable DLL
+  await project.write('vue.config.js', 'module.exports = { dll: true }')
+
+  const { stdout } = await project.run('vue-cli-service build')
+  expect(stdout).toMatch('Build complete.')
+
+  expect(project.has('dist/index.html')).toBe(true)
+  expect(project.has('dist/favicon.ico')).toBe(true)
+  expect(project.has('dist/js')).toBe(true)
+  expect(project.has('dist/css')).toBe(true)
+
+  const index = await project.read('dist/index.html')
+  // should preload app.js & vendor.js
+  expect(index).toMatch(/<link rel=preload [^>]+app[^>]+\.js>/)
+  expect(index).toMatch(/<link rel=preload [^>]+vendor[^>]+\.js>/)
+
+  const vendorFile = index.match(/<link rel=preload [^>]+(vendor[^>]+\.js)>/)[1]
+  const vendor = await project.read(`dist/js/${vendorFile}`)
+  expect(vendor).toMatch(`router-link`)
+  expect(vendor).toMatch(`vuex`)
+
+  const port = await portfinder.getPortPromise()
+  server = createServer({ root: path.join(project.dir, 'dist') })
+
+  await new Promise((resolve, reject) => {
+    server.listen(port, err => {
+      if (err) return reject(err)
+      resolve()
+    })
+  })
+
+  const launched = await launchPuppeteer(`http://localhost:${port}/`)
+  browser = launched.browser
+  page = launched.page
+
+  const h1Text = await page.evaluate(() => {
+    return document.querySelector('h1').textContent
+  })
+
+  expect(h1Text).toMatch('Welcome to Your Vue.js App')
+})
+
+afterAll(async () => {
+  await browser.close()
+  server.close()
+})