improves test performance on mongodb (#4862)

* improves test performance on mongodb

* Removes unused methdos

spec/HTTPRequest.spec.js

@@ -8,35 +8,45 @@ const httpRequest = require("../src/cloud-code/httpRequest"),
 const port = 13371;
 const httpRequestServer = "http://localhost:" + port;
 
-const app = express();
-app.use(bodyParser.json({ 'type': '*/*' }));
-app.get("/hello", function(req, res){
-  res.json({response: "OK"});
-});
+function startServer(done) {
+  const app = express();
+  app.use(bodyParser.json({ 'type': '*/*' }));
+  app.get("/hello", function(req, res){
+    res.json({response: "OK"});
+  });
 
-app.get("/404", function(req, res){
-  res.status(404);
-  res.send("NO");
-});
+  app.get("/404", function(req, res){
+    res.status(404);
+    res.send("NO");
+  });
 
-app.get("/301", function(req, res){
-  res.status(301);
-  res.location("/hello");
-  res.send();
-});
+  app.get("/301", function(req, res){
+    res.status(301);
+    res.location("/hello");
+    res.send();
+  });
 
-app.post('/echo', function(req, res){
-  res.json(req.body);
-});
+  app.post('/echo', function(req, res){
+    res.json(req.body);
+  });
 
-app.get('/qs', function(req, res){
-  res.json(req.query);
-});
-
-app.listen(13371);
+  app.get('/qs', function(req, res){
+    res.json(req.query);
+  });
 
+  return app.listen(13371, undefined, done);
+}
 
 describe("httpRequest", () => {
+  let server;
+  beforeAll((done) => {
+    server = startServer(done);
+  });
+
+  afterAll((done) => {
+    server.close(done);
+  });
+
   it("should do /hello", (done) => {
     httpRequest({
       url: httpRequestServer + "/hello"