Mocking a service in another service from a different module - angularjs

Question

I have a service that depends on another service from a different module like so:
(function() {
'use strict';
angular
.module('app.core')
.factory('userService', userService);
function authService() {
return: {
userLoggedIn: false
}
}
})();
(function() {
'use strict';
angular
.module('app.services')
.factory('AuthService', authService);
authService.$inject = ['$http', 'userService'];
function authService($http, userService) {
}
I'm trying write tests for my authService but am getting injection errors since it can't find userService
beforeEach(function() {
module('app.services');
});
beforeEach(inject(function(_AuthService_) {
authService = _AuthService_;
}));
How can I overcome this, will using $provide help me here?
UPDATE
I have attempted the following, but still getting the error
beforeEach(function() {
module('app.services');
});
beforeEach(inject(function(_AuthService_, _$provide_) {
authService = _AuthService_;
$provide = _$provide_;
}));
beforeEach(function() {
module(function ($provide) {
$provide.value('userService', function(){
return {
userLoggedIn: false
}
});
});
});
SOLVED
Ok, so I just needed to do the following:
beforeEach(function() {
module('app.dataservices');
module(function ($provide) {
$provide.value('userService', function(){
return {
userLoggedIn: false
}
});
});
});
beforeEach(inject(function(_AuthService_) {
authService = _AuthService_;
}));
Tests are now passing fine for me

Answer 1

Let's say you service uses the $state service and you want to mock id. Specifically the get method. Then you just need to add inside the first describe something like this.
beforeEach(function () {
module(function ($provide) {
$provide.service('$state', function() {
return {
get: function() {}
}
});
});
});
In this gist you can find some interesting examples of mocking services using $provide.

Answer 2

you should be preloading all services in your karma.conf.js (i assume you are using karma).
here is our karma.conf.js file ...
/**
* Karma test runner configuration
*/
'use strict';
module.exports = function (config) {
config.set({
basePath: './',
browsers: ['PhantomJS'],
frameworks: ['jasmine'],
reporters: ['mocha', 'coverage'],
singleRun: true,
preprocessors: {
'src/**/!(*spec)*.js': ['coverage'],
'dest/**/*.html': ['ng-html2js']
},
ngHtml2JsPreprocessor: {
stripPrefix: 'dest/',
moduleName: 'ngHtmlFiles'
},
coverageReporter: {
type: 'html',
dir: 'coverage'
},
files: [
'dest/vendor.min.js',
'bower_components/angular-mocks/angular-mocks.js',
'src/**/*.js',
'dest/**/*.html'
]
});
};