pubsub-js-ssr/test/test-subscribe.js

Dependency free publish/subscribe library. Fork from pubsub-js but supporting ssr.

'use strict';

var PubSub = require('../src/pubsub'),
    TestHelper = require('../test/helper'),
    assert = require('referee').assert,
    refute = require('referee').refute;

describe( 'subscribe method', function() {
    it('should return token as String', function(){
        var func = function(){ return undefined; },
            message = TestHelper.getUniqueString(),
            token = PubSub.subscribe( message , func );

        assert.isString( token );
    });

    it('should return new token for several subscriptions with same function', function(){
        var func = function(){ return undefined; },
            tokens = [],
            iterations = 10,
            message = TestHelper.getUniqueString(),
            i;

        // build an array of tokens
        for ( i = 0; i < iterations; i++ ){
            tokens.push( PubSub.subscribe( message, func ) );
        }
        // make sure all tokens are different
        TestHelper.assertAllTokensDifferent( tokens );
    });

    it('should return unique tokens for each namespaced subscription', function(){
        var func = function(){ return undefined; },
            tokens = [],
            messages = ['library', 'library.music', 'library.music.jazz'],
            i;

        // build an array of tokens
        for ( i = 0; i < messages.length; i++ ){
            tokens.push( PubSub.subscribe( messages[i], func ) );
        }
        // make sure all tokens are different
        TestHelper.assertAllTokensDifferent( tokens );
    });

    it('should return unique token for unique functions', function(){
        var tokens = [],
            iterations = 10,
            message = TestHelper.getUniqueString(),
            i;

        function bakeFunc( value ){
            return function(){
                return value;
            };
        }

        // build an array of tokens, passing in a different function for each subscription
        for ( i = 0; i < iterations; i++ ){
            tokens.push( PubSub.subscribe( message, bakeFunc( i ) ) );
        }

        // make sure all tokens are different
        TestHelper.assertAllTokensDifferent( tokens );
    });

    it('should return false when subscriber argument is not a function', function(){
        var invalidSubscribers = [undefined, null, 'a string', 123, [], {}, new Date()],
            topic = TestHelper.getUniqueString(),
            i;

        for ( i = 0; i < invalidSubscribers.length; i++ ){
            assert.equals(PubSub.subscribe(topic, invalidSubscribers[i]), false);
        }

        assert.equals(i, invalidSubscribers.length);
    });

    it('must not throw errors when publishing with invalid subscribers', function(){
        var invalidSubscribers = [undefined, null, 'a string', 123, [], {}, new Date()],
            topic = TestHelper.getUniqueString(),
            i;

        for (i = 0; i < invalidSubscribers.length; i++){
            PubSub.subscribe(topic, invalidSubscribers[i]);
        }

        refute.exception(function(){
            PubSub.publish(topic, TestHelper.getUniqueString());
        });
    });
});