jupiter/test/single-message.spec.js

Simple, minimal & dependency-free JavaScript Publish/Subscribe

var jupiter = require('../src/jupiter');

describe('Jupiter Single Message', function() {

    it('Allow a function to subscribe & be called', function() {
        var ns = {
            'name': 'directSubscribe',
            'fn': function(arg) {},
            'arg': '_argumentDirect'
        };

        spyOn(ns, 'fn');

        jupiter(ns.name).sub(ns.fn).pub(ns.arg);

        expect(ns.fn).toHaveBeenCalledWith(ns.arg);
    });

    it('Allow a function to subscribe & be called with optional context', function() {
        var ns = {
            'name': 'directSubscribe',
            'fn': function(arg) {
                expect(typeof this.results_).toEqual('object');
            },
            'arg': '_argumentDirect'
        };

        spyOn(ns, 'fn').andCallThrough();

        jupiter(ns.name).sub(ns.fn, this).pub(ns.arg);

        expect(ns.fn).toHaveBeenCalledWith(ns.arg);
    });


    it('Allow a function to subscribe & be called with optional key & context', function() {
        var _this = this;
        var ns = {
            'name': 'directSubscribe',
            'fn': function(arg) {
                expect(typeof this.results_).toEqual('object');
            },
            'arg': '_argumentDirect',
            'key': '_testFn'
        };

        spyOn(ns, 'fn').andCallThrough();

        jupiter(ns.name).sub(ns.key, ns.fn, _this).pub(ns.arg);

        expect(ns.fn).toHaveBeenCalledWith(ns.arg);
    });

    it('Allow a function to subscribe, be called, & unsubscribed', function() {
        var ns = {
            'name': 'testUnsubscribe1',
            'fn': function(arg) {},
            'arg': '_argumentUnsub'
        };
        var testUnsubscribe = jupiter(ns.name);

        spyOn(ns, 'fn');

        testUnsubscribe.sub(ns.fn).pub(ns.arg);

        expect(ns.fn).toHaveBeenCalledWith(ns.arg);

        testUnsubscribe.unsub();

        testUnsubscribe.list(function(topics) {
            expect(topics).toBeUndefined();
        });
    });

    it('Allow a function to subscribe & unsubscribe, then test to make sure it cannot be called', function() {
        var ns = {
            'name': 'testUnsubscribe1',
            'fn': function(arg) {},
            'arg': '_argumentUnsub'
        };
        var testUnsubscribe = jupiter(ns.name);

        spyOn(ns, 'fn');

        testUnsubscribe
            .sub(ns.fn)
            .unsub()
            .pub(ns.arg);

        expect(ns.fn).not.toHaveBeenCalledWith(ns.arg);

    });

    it('Allow a function with optional key to subscribe, be called, & unsubscribed', function() {
        var ns = {
            'name': 'testUnsubscribe2',
            'fn': function(arg) {},
            'arg': '_argumentUnsub',
            'key': '_testFn'
        };
        var testUnsubscribe = jupiter(ns.name);

        spyOn(ns, 'fn');

        testUnsubscribe.sub(ns.key, ns.fn).pub(ns.arg);

        expect(ns.fn).toHaveBeenCalledWith(ns.arg);

        testUnsubscribe.list(function(topics) {
            expect(topics[0].key).toBe(ns.key);
        });

        testUnsubscribe.unsub(ns.key);

        testUnsubscribe.list(function(topics) {
            expect(topics).toEqual([]);
        });
    });
});