chore: refactor cloudsql_postgresql test from repo-tools (#1722)

Author: sofisl

appengine/cloudsql_postgresql/package.json

@@ -13,21 +13,22 @@
     "node": ">=8.0.0"
   },
   "scripts": {
-    "unit-test": "mocha test/*.test.js --timeout=30000",
+    "unit-test": "mocha test/createTables.test.js --timeout=30000 && mocha test/server.test.js",
     "start-proxy": "! pgrep cloud_sql_proxy > /dev/null && cloud_sql_proxy -instances=$INSTANCE_CONNECTION_NAME=tcp:$SQL_PORT &",
-    "system-test": "repo-tools test app -- server.js",
+    "system-test": "mocha test/serverListening.test.js --exit",
     "system-test-proxy": "npm run start-proxy; npm run system-test",
     "all-test": "npm run unit-test && npm run system-test",
     "test": "npm -- run all-test"
   },
   "dependencies": {
+    "chai": "^4.2.0",
     "express": "^4.16.4",
     "knex": "^0.20.0",
     "pg": "^8.0.0",
-    "prompt": "^1.0.0"
+    "prompt": "^1.0.0",
+    "wait-port": "^0.2.7"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
     "sinon": "^9.0.0",

appengine/cloudsql_postgresql/test/serverListening.test.js

@@ -0,0 +1,15 @@
+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, '../server.js');
+
+describe('server listening', () => {
+  it('should be listening', async () => {
+    const child = childProcess.exec(`node ${appPath}`);
+    const isOpen = await waitPort({port: PORT});
+    expect(isOpen).to.be.true;
+    process.kill(child.pid, 'SIGTERM');
+  });
+});