test(server): add SockJSServer test (#1956)

* test(server): added SockJSServer test

* test(server): change test done callback

test/SockJSServer.test.js

@@ -0,0 +1,64 @@
+'use strict';
+
+const http = require('http');
+const express = require('express');
+const SockJS = require('sockjs-client/dist/sockjs');
+const SockJSServer = require('../lib/servers/SockJSServer');
+
+describe('SockJSServer', () => {
+  let socketServer;
+  let listeningApp;
+
+  beforeAll((done) => {
+    // eslint-disable-next-line new-cap
+    const app = new express();
+    listeningApp = http.createServer(app);
+    listeningApp.listen(8080, 'localhost', () => {
+      const server = {
+        log: {
+          error: () => {},
+          debug: () => {},
+        },
+        sockPath: '/sockjs-node',
+        listeningApp,
+      };
+      socketServer = new SockJSServer(server);
+      done();
+    });
+  });
+
+  describe('server', () => {
+    it('should recieve connection, send message, and close client', (done) => {
+      const data = [];
+      socketServer.onConnection((connection) => {
+        data.push('open');
+        socketServer.send(connection, 'hello world');
+        setTimeout(() => {
+          socketServer.close(connection);
+        }, 1000);
+      });
+
+      const client = new SockJS('http://localhost:8080/sockjs-node');
+
+      client.onmessage = function(e) {
+        data.push(e.data);
+      };
+
+      client.onclose = function() {
+        data.push('close');
+      };
+
+      setTimeout(() => {
+        expect(data.length).toEqual(3);
+        expect(data[0]).toEqual('open');
+        expect(data[1]).toEqual('hello world');
+        expect(data[2]).toEqual('close');
+        done();
+      }, 3000);
+    });
+  });
+
+  afterAll((done) => {
+    listeningApp.close(done);
+  });
+});