chore: refactor pubsub test (#1693)

appengine/pubsub/package.json

@@ -10,18 +10,20 @@
   },
   "scripts": {
     "start": "node app.js",
-    "test": "repo-tools test app && mocha test/app.test.js --timeout=30000 --exit"
+    "test": "mocha test/*.test.js --timeout=30000 --exit"
   },
   "dependencies": {
     "@google-cloud/pubsub": "^1.0.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
     "google-auth-library": "^6.0.0",
-    "pug": "^2.0.1"
+    "path": "^0.12.7",
+    "pug": "^2.0.1",
+    "wait-port": "^0.2.7"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "jsonwebtoken": "^8.5.1",
+    "chai": "^4.2.0",
     "mocha": "^7.0.0",
     "sinon": "^9.0.0",
     "uuid": "^7.0.0",

appengine/pubsub/test/appListening.test.js

@@ -0,0 +1,14 @@
+const waitPort = require('wait-port');
+const {expect} = require('chai');
+const PORT = process.env.PORT || 8080;
+const childProcess = require('child_process');
+const path = require('path');
+const appPath = path.join(__dirname, '../app.js');
+
+describe('server listening', () => {
+  it('should be listening', async () => {
+    await childProcess.exec(`node ${appPath}`);
+    const isOpen = await waitPort({port: PORT});
+    expect(isOpen).to.be.true;
+  });
+});