Example AngularJS Services Unit Testing ( Mock all $http dependencies )

Angular-Services-Mock.js

angular.module('angularApp')

.factory('loadConfig', function($http) {
  return {
		getPageInfo : function(page) {
			return $http.get('configurations/en/' + page + '.json').then(
					function(response) {
						return response.data;
					});
		}
	};
})

servicesTest.js

'use strict';

describe('Services: loadConfig ', function () {

    var scope, loadConfig, httpBackend;

    beforeEach(function () {

        //load the module.
        module('angularApp');

        //inject your service for testing.
        inject(function ($httpBackend, $injector, $rootScope) {
            loadConfig = $injector.get('loadConfig');
            httpBackend = $httpBackend;
            scope = $rootScope.$new();
        });

    });

    //check our expectations were missed in tests.
    afterEach(function () {
        httpBackend.verifyNoOutstandingExpectation();
        httpBackend.verifyNoOutstandingRequest();
    });

    it('should return msg and verify expexctations', function () {
        
        var returnData = { excited: "so much" };

        httpBackend.whenGET('configurations/en/main.json').respond(returnData);
        
        //promise object
        var returnedPromise = loadConfig.getPageInfo('main');
        
        //we handle with promise object
        returnedPromise.then(function(data){
            expect(data.excited).toBe("so much");
        });
        
        //flush for http request
        httpBackend.flush();

    });

});