test: test for optional public dir

Author: yyx990803

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

@@ -1,5 +1,7 @@
 jest.setTimeout(45000)
 
+const path = require('path')
+const fs = require('fs-extra')
 const { defaultPreset } = require('@vue/cli/lib/options')
 const create = require('@vue/cli-test-utils/createTestProject')
 const serve = require('@vue/cli-test-utils/serveWithPuppeteer')
@@ -50,8 +52,6 @@ test('serve with router', async () => {
 test('serve with inline entry', async () => {
   const project = await create('e2e-serve-inline-entry', defaultPreset)
 
-  const path = require('path')
-  const fs = require('fs-extra')
   await fs.move(
     path.resolve(project.dir, 'src/main.js'),
     path.resolve(project.dir, 'src/index.js')
@@ -72,3 +72,24 @@ test('serve with inline entry', async () => {
     }
   )
 })
+
+test('serve with no public dir', async () => {
+  const project = await create('e2e-serve-no-public', defaultPreset)
+
+  await fs.remove(path.resolve(project.dir, 'public'))
+
+  await serve(
+    () => project.run('vue-cli-service serve'),
+    async ({ nextUpdate, helpers }) => {
+      const msg = `Welcome to Your Vue.js App`
+      expect(await helpers.getText('h1')).toMatch(msg)
+
+      // test hot reload
+      const file = await project.read(`src/App.vue`)
+      project.write(`src/App.vue`, file.replace(msg, `Updated`))
+      await nextUpdate() // wait for child stdout update signal
+      await sleep(1000) // give the client time to update
+      expect(await helpers.getText('h1')).toMatch(`Updated`)
+    }
+  )
+})