Injecting dependent services when unit testing AngularJS services

Actually in AngularJS Dependency Injection uses the ‘last wins’ rule. So you can define your service in your test just after including your module and dependencies, and then when service A that you’re testing will request service B using DI, AngularJS will give mocked version of service B.

This is often is done by defining new module like MyAppMocks, putting mocked services/values there and then just adding this module as dependency.

Kind of (schematically):

beforeEach(function() {
  angular.module('MyAppMocks',[]).service('B', ...));
  angular.module('Test',['MyApp','MyAppMocks']);
  ...