A basic stub for the Crossrider javascript API I use for local unit testing of browser extensions. It's by no means complete, so feel free to add/improve. Usage: *first reference this stub in your test html to make the stub available for your own code *next, reference the background.js in your test html (the order of script includes is important…

CrossriderStub.js

var appAPI = (function () {
    var tabListener;
    var backGroundListener;
    var storedValue = null;

    return {

        ready: function (callback) { callback(); },
        message: {
            addListener: function (listener) {
                //dirty hack: load the background.js first in the test html, this will bind its listener first
                if (!backGroundListener)
                    backGroundListener = listener;
                else {
                    tabListener = listener;
                }
            },
            toBackground: function (message) {
                if (backGroundListener)
                    backGroundListener(message);
                else
                    console.log('could not find the background listener!');
            },
            toActiveTab: function (message) {
                console.log('sending a message to the active tab:');
                console.log(message);
                tabListener(message);
            },
            toAllTabs: function (message) {
                if (tabListener)
                    tabListener(message);
                else
                    console.log('could not find the tab listener!');
            },
            getTabListener: function () {
                return tabListener;
            },
            getBackgroundListener: function () {
                return backGroundListener;
            }
        },
        resources: {
            includeJS: function (path) {console.log("loading JS: "+path); },
            includeCSS: function (path) { console.log("loading CSS: " + path); },
            getImage: function (path) { console.log("loading img: " + path); return 'http://localhost:8081/src/Resources/' + path; }
        },
        getTabId: function () { return 1; },
        db: {
            get: function (key) { return storedValue; },
            set: function (key, value) {storedValue = value; },
            removeAll: function () { storedValue = null; }
        },
        request: {
            get: function (url, onsuccess, onfailure) {
                console.log("GET request on: " + url);
                var response = "undefined REST endpoint";
                if (url.indexOf("API/Search/Get") != -1)
                    response = JSON.stringify({ "testData" : "testdata" });
                onsuccess(response);
            },
            post: function (url, params, onsuccess, onfailure) {
                console.log("POST request on: " + url + ", params: " + params);
                onsuccess();
            }
        },
        JSON: {
            parse: function (data) {
                return JSON.parse(data);
            },
            stringify: function (data) {
                return JSON.stringify(data);
            }
        },
        openURL: function(url, destination) {
            console.log('appAPI.openURL(' + url + ') was called');
        }
    };
})();