Testing a service resolution in a controller through unit testing

As I attempt to create a test for my home module, I keep encountering an error that reads "unknown provider: service." Interestingly, when I modify resolveSomething in my home module to output a string, the app functions as expected, indicating that the resolve is functioning properly. Since I am still in the process of learning how to write tests, any guidance or recommendations would be greatly valued.

Service

angular.module( 'services', [])
.factory('service', function(){ 
    return {
        'users' : function(id) {
            return id; 
        }
    }
}); 

Relevant part of Home

angular.module('home', ['ui.router','services'])
.config(function config( $stateProvider, service) {
    $stateProvider.state( 'homeWithId', {
        url: '/home/:id',
        views: {
            "main": {
                controller: 'HomeCtrl',
                templateUrl: 'home/home.tpl.html'
            }
        },
        resolve:{
            resolveSomething: function() {
                return service.users(this.params.id);
            }
        }       
    })
})...

Relevant part of Test... I think

describe( 'Test home controller', function() {
    beforeEach( module( 'home' ) );
    beforeEach( module( 'services' ) );
    beforeEach(inject(function($injector) {
        $location = $injector.get('$location');
        $rootScope = $injector.get('$rootScope');
        $httpBackend = $injector.get('$httpBackend');
        $scope = $rootScope.$new();
        $state = $injector.get('$state');
        service = $injector.get('service');

        var $controller = $injector.get('$controller');

        createController = function() {
            return $controller('HomeCtrl', {
                '$scope': $scope,
                 resolveSomething: function() { console.log('resolveSomething'); },
                 service  : service
             });
        };
    ...

By the way, it's worth noting that with this test setup, I can access the service within my controller if I simply provide a string in the resolve.

Home controller (functional and testable)

.controller( 'HomeCtrl', ['$scope', 'resolveSomething','service', function( $scope, resolveSomething, service) {

    alert(service.users(1));
    ...

Answer №1

The issue at hand is that the variable service is being treated as a service instead of a provider in this scenario. When using module.config(), only providers can be injected; as a result, the service has not yet been instantiated. To resolve this, it may be necessary to modify the resolver to include the service as a dependency (assuming no prior experience with the UI state provider):

angular.module('home', ['ui.router','services'])
.config(function config($stateProvider) {
    $stateProvider.state( 'homeWithId', {
        url: '/home/:id',
        views: {
            "main": {
                controller: 'HomeCtrl',
                templateUrl: 'home/home.tpl.html'
            }
        },
        resolve:{
            resolveSomething: function(service) {
                return service.users(this.params.id);
            }
        }       
    });
});

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