How to test AngularJS custom provider

Question

Does anyone have an example of how to unit test a provider?

For example:

config.js

angular.module('app.config', [])   .provider('config', function () {     var config = {           mode: 'distributed',           api:  'path/to/api'         };      this.mode = function (type) {       if (type) {         config.isDistributedInstance = type === config.mode;         config.isLocalInstance = !config.isDistributedInstance;         config.mode = type;         return this;       } else {         return config.mode;       }     };      this.$get = function () {       return config;     };   }]); 

app.js

angular.module('app', ['app.config'])   .config(['configProvider', function (configProvider) {     configProvider.mode('local');   }]); 

app.js is using in tests and I see already configured configProvider and I can test it as a service. But how can I test the ability to configure? Or it does not need at all?

Answer 1

I had this same question and only found a working solution in this Google Group answer and it's referenced fiddle example.

Testing your provider code would look something like this (following the code in the fiddle example and what worked for me):

describe('Test app.config provider', function () {      var theConfigProvider;      beforeEach(function () {         // Initialize the service provider          // by injecting it to a fake module's config block         var fakeModule = angular.module('test.app.config', function () {});         fakeModule.config( function (configProvider) {             theConfigProvider = configProvider;         });         // Initialize test.app injector         module('app.config', 'test.app.config');          // Kickstart the injectors previously registered          // with calls to angular.mock.module         inject(function () {});     });      describe('with custom configuration', function () {         it('tests the providers internal function', function () {             // check sanity             expect(theConfigProvider).not.toBeUndefined();             // configure the provider             theConfigProvider.mode('local');             // test an instance of the provider for              // the custom configuration changes             expect(theConfigProvider.$get().mode).toBe('local');         });     });  });