适用于https服务器的Mocha Web套接字测试

Question

I've been trying to test a web socket connection. There a few good tutorials out there that describe it which led me to this sort of dummy code just to see if I can test data being sent over websockets:

var socketURL= 'https://localhost:9002';
var io = require('socket.io-client');
options={
transports: ['websocket'],
'force new connection': true
};
describe("Connection test", function(){
it('to check if data is received',function(done){
    var client = io.connect(socketURL,options);

    client.on('connect',function(){
        console.log("in connect");
        client.emit('data',{data:10});

        client.on('result',function(data){
            console.log(data);
            data.should.equal(10);
            done();
        });

    });
});

I've set up the server like so, where the OPTIONS determine the key and cert to read

var app = express();
var httpsServer = https.createServer(OPTIONS, app);

httpsServer.listen(9002);
var io = require('socket.io').listen(httpsServer);
io.on('connection', function(socket){
    socket.on('data', function(data){
        socket.emit('result',data);
    })
})

The problem is that the client.on('connect') is never called, I can see this by nothing printing out to the console. All that happens is a time out error: "timeout of 2000ms exceeded. Ensure the done() callback is being called in this test." I've moved the done() and it doesn't make a diffence. I think the problem is that the tutorials I've follow use a http server whereas I'm using a https server, and I figure that this may require addition methods to connect, however I'm quite new to mocha so I don't know what they may be. Any help would be appreciated

Answer 1

Are you using self-signed certificates? If so, running your code like this:

 env DEBUG=* mocha test/example.js

gives the following error:

Mon, 04 Jul 2016 11:22:20 GMT engine.io-client:socket socket error {"type":"TransportError","description":{"code":"UNABLE_TO_VERIFY_LEAF_SIGNATURE","type":"error","target":{"domain":null,"_events":{},"_eventsCount":4,"_socket":null,"_ultron":null,"_closeReceived":false,"bytesReceived":0,"readyState":0,"supports":{"binary":true},"extensions":{},"_isServer":false,"url":"wss://localhost:9002/socket.io/?EIO=3&transport=websocket","protocolVersion":13,"binaryType":"buffer"}}}

Note the UNABLE_TO_VERIFY_LEAF_SIGNATURE

So, add the certificate authority to the client options, eg

options={
ca: fs.readFileSync(path.join(__dirname, '..', 'certs', 'client', 'my-root-ca.crt.pem')),
transports: ['websocket'],
'force new connection': true
};

fix

    data.data.should.equal(10);

and your test passes:

  Connection test
in connect
{ data: 10 }
    √ to check if data is received (68ms)


  1 passing (75ms)

Answer 2

If you pass done in mocha test case, by default timeout period is 2000ms (2 seconds). It needs more time to connect to your web socket connection.

The given error time out error: "timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.

Problem should be fixed with the following code :

it('to check if data is received',function(done){

    this.timeout(60000);  // 60 seconds
    var client = io.connect(socketURL,options);

    client.on('connect',function(){
        console.log("in connect");
        client.emit('data',{data:10});

        client.on('result',function(data){
            console.log(data);
            data.should.equal(10);
            done();
        });

    });
});

this.timeout(60000) tells mocha to wait 60 seconds to complete the test case.