Setup tests and applied minor fixes for the App Engine Websockets sample (#1865)

See also cl/315382224.

Fixes #1825.

Author: chenyumic

.kokoro/appengine/node10/websockets.cfg

@@ -0,0 +1,18 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Set the folder in which the tests are run
+env_vars: {
+    key: "PROJECT"
+    value: "appengine/websockets"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-docs-samples/.kokoro/build.sh"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:10-puppeteer"
+}

.kokoro/appengine/node12/websockets.cfg

@@ -0,0 +1,19 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Set the folder in which the tests are run
+env_vars: {
+    key: "PROJECT"
+    value: "appengine/websockets"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-docs-samples/.kokoro/build.sh"
+}
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:12-puppeteer"
+}

appengine/websockets/app.js

@@ -39,3 +39,5 @@ if (module === require.main) {
   });
 }
 // [END appengine_websockets_app]
+
+module.exports = server

appengine/websockets/package.json

@@ -6,7 +6,7 @@
   "license": "Apache Version 2.0",
   "author": "Google Inc.",
   "engines": {
-    "node": ">=8.0.0"
+    "node": ">=10.18.1"
   },
   "scripts": {
     "deploy": "gcloud app deploy",

appengine/websockets/test/app.test.js

@@ -1,6 +1,6 @@
 const supertest = require('supertest');
 const path = require('path');
-const app = require(path.join(__dirname, '../', 'app.js'));
+const app = require(path.join(path.dirname(__dirname), 'app.js'));
 
 it('should be listening', async () => {
   await supertest(app).get('/').expect(200);

appengine/websockets/test/index.test.js

@@ -15,18 +15,28 @@
 'use strict';
 
 const assert = require('assert');
+const path = require('path');
+const app = require(path.join(path.dirname(__dirname), 'app.js'));
 const puppeteer = require('puppeteer');
 /* global document */
 
 let browser, browserPage;
 
 before(async () => {
-  browser = await puppeteer.launch();
+  const PORT = process.env.PORT || 8080;
+  app.listen(PORT, () => {});
+
+  browser = await puppeteer.launch({
+    args: [
+      '--no-sandbox',
+      '--disable-setuid-sandbox',
+    ]});
   browserPage = await browser.newPage();
 });
 
 after(async () => {
   await browser.close();
+  await app.close();
 });
 
 describe('appengine_websockets_app', () => {