What are the steps to incorporate websockets into the jasmine framework?

Currently, I am attempting to perform Unit Testing using the Jasmine framework with a websocket (jasmine-2.4.1 version).

While the send function for the websocket is working correctly, there seems to be an issue with the onmessage function.

The returned value is showing up as undefined.

Below is the code snippet that I am working with:

var ws;
beforeEach(function() {
    ws = new WebSocket("ws://myaddress:port");
});

describe("Module Test", function() {

    it("first test", function (done) {
        // Send data to the server
        ws.onopen = function(e) {
            ws.send(JSON.stringify({"module":"test","func":"test_func"}));
        };

        var result;
        ws.onmessage = function(e) {
            result = JSON.parse(e.data.rsp);
            console.log(result); // <- this result value is true...
        };

        // The server returns a result value of 'true', however, when trying to access it here, it shows as undefined...
        expect(result).toBe(true);
        done();
    });
});

Answer №1

Make sure to validate the truthiness of the result after receiving the message, not before. I may be mistaken about the issue, but adjusting your test code this way could resolve it:

var connection;
beforeEach(function() {
    connection = new WebSocket("ws://myaddress:port");
});

describe("Testing Module", function () {

    it("first test case", function (done) {
        connection.onopen = function(e) {
            connection.send(JSON.stringify({"module":"test","func":"test_func"}));
        };

        connection.onmessage = function(e) {
            var response = JSON.parse(e.data.rsp);
            expect(response).toBeTruthy();
            done();
        };
    });
});

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