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Intercepts connection and allows to simulate server behaviour.

Full documentation is available here:

The can-fixture-socket module exports an object with:

  • Server, a constructor function which instance intercepts a connection.
  • requestHandlerToListener, a helper to convert XHR request handler into socket event listener. This is useful when using module.
  • storeToListeners, a helper to convert all request handlers into socket event listeners.

With three simple steps you can test your real-time application that uses

  1. instantiate server to intercept;
  2. mock server behaviour;
  3. test your application.

Table of Content


Use npm to install can-fixture-socket:

npm install can-fixture-socket --save


Use basics

Lets say we wanted to test a simple app that connects to, and once connected, creates a message, and logs when the message is created.

That app could look like the following:

var socket = io();
socket.on("connect", function(){
  socket.emit("messages create", {text: "A new message"});
socket.on("message created", function(data){
  // data.text === "A new message"
  console.log("Server sent out a new message we just created", data);

To test this, we'll first use can-fixture-socket.Server to intercept the socket connection:

var io = require("");
var fixtureSocket = require("can-fixture-socket");
var mockServer = new fixtureSocket.Server(io);

Now we can mock the socket server by creating socket event listeners and emitting socket events:

mockServer.on("messages create", function(data){
  console.log("New message received", data);
  mockServer.emit("message created", data);

Acknowledgement callbacks

We also can use acknowledgement callbacks:

mockServer.on("users create", function(user, ackCb){
  console.log("Simulating saving a new user to DB and return the new user id", user);

    id: Math.random()

Client code:

var socket = io();
socket.on("connect", function(){
  socket.emit("users create", {name: "Ilya", likes: "skiing"}, function (data) {
    // data is what server calls the acknowledgement callback
    // with (e.g. is the new user id).

Use with can-fixture.Store

With can-fixture we can create a store of items and emulate a fully working CRUD service. Optionally, we can use can-set.Algebra to power our store filtering, pagination, and sorting abilities.

// Import can-fixture that provides `store` method for creating a store:
var fixture = require("can-fixture");
var canSet = require("can-set");

// Create a fixture store:
var messagesStore =[
  {id: 1, title: "One"},
  {id: 2, title: "Two"},
  {id: 3, title: "Three"}
], new canSet.Algebra({}));

We can mock the connection with the rich behavior of fixture stores using the requestHandlerToListener helper. The requestHandlerToListener function converts a fixture store request handler (e.g. getListData) to a event listener.

var fixtureSocket = require("can-fixture-socket");
var io = require("");
var mockServer = new fixtureSocket.Server(io);

var toListener = fixtureSocket.requestHandlerToListener;
mockServer.on("messages get", toListener( messagesStore.getData ));

Or we can use storeToListeners helper to convert all CRUD fixture store request handlers into event listeners:

var listeners = fixtureSocket.storeToListeners( messagesStore );
  "messages remove": listeners.destroyData,
  "messages create": listeners.createData,
  "messages update": listeners.updateData

Use with FeathersJS

FeathersJS is a minimalist, service-oriented, real-time web framework for modern applications. It is a NodeJS framework built on top of Express. It allows you to build REST-ful services and works with three providers: standard HTTP communication, WebSockets and Primus.

The mocked server exposes onFeathersService method to simulate FeathersJS CRUD services.

For example, given the following FeathersJS client app:

var socket = io("");
var app = feathers()

// Create FeathersJS CRUD service for "messages" resource:
var messagesService = app.service("messages");

We can simulate it with a as follows:

var messagesStore =[
  {id: 1, title: "One"},
  {id: 2, title: "Two"},
  {id: 3, title: "Three"}
], new canSet.Algebra({}));

mockServer.onFeathersService("messages", fixtureStore);

Now you can test your FeathersJS app:

  assert.equal(, 3, "find should receive 3 items");
  assert.deepEqual(data, {id: 1, title: "One"}, "get should receive an item");
messagesService.create({title: "Four"}).then(function(data){
  assert.equal(data.title, "Four", "create should add an new item");

ES6 use

With StealJS, you can import this module directly in a template that is autorendered:

import plugin from 'can-fixture-socket';

AMD use

Configure the can and jquery paths and the can-fixture-socket package:

<script src="require.js"></script>
    paths: {
      "jquery": "node_modules/jquery/dist/jquery",
      "can": "node_modules/canjs/dist/amd/can"
    packages: [{
      name: 'can-fixture-socket',
      location: 'node_modules/can-fixture-socket/dist/amd',
      main: 'lib/can-fixture-socket'
  require(["main-amd"], function(){});

Standalone use

Load the global version of the plugin:

<script src='./node_modules/can-fixture-socket/dist/global/can-fixture-socket.js'></script>


Making a Build

To make a build of the distributables into dist/ in the cloned repository run

npm install
node build

Running the tests

Tests can run in the browser by opening a webserver and visiting the test.html page. Automated tests that run the tests from the command line in Firefox can be run with

npm test