Simple example of unit testing run block in angular

app.run.spec.js

describe('run block', function(){
 var sandbox,
     MockCookieStore,
     MockAuthService,
     token 
beforeEach(function(){ 
  sandbox = sinon.sandbox.create() 
  MockCookieStore = sandbox.stub({get:function(key){}})   
  MockAuthService = sandbox.stub({LoadToken:function(uObj){}}) 
  
  token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOjEyMzQ1Njc4OTAsIm5hbWUiOiJKb2huIERvZSIsImFkbWluIjp0cnVlfQ.eoaDVGTClRdfxUZXiPs3f8FmJDkDE_VCQFXqKxpLsts' 

  module('MyApplication',function($provide){ 
   $provide.value('$cookieStore',MockCookieStore)   
   $provide.value('AuthService',MockAuthService) 
  }) 
}) 

afterEach(function(){ 
  sandbox.restore() 
}) 

it('should check for a token cookie and load it if found', function(done){ 
  MockCookieStore.get.returns(token) 
  
  inject() //THIS IS THE KEY! 
  
  expect(MockCookieStore.get).to.have.been.calledWith('auth-token')   
  expect(MockAuthService.LoadToken).to.have.been.calledWith(token) 
  done() 
}) 

it('should not try to load a token when one is not found', function(done){ 
  MockCookieStore.get.returns(undefined) 
   
  inject() //THIS IS THE KEY!
  
  expect(MockCookieStore.get).to.have.been.calledWith('auth-token')   
  expect(MockAuthService.LoadToken).not.to.have.been.called 
  done()   
  }) 
})

Unit Test Angular Run Block.js

(function () { 
  angular.module('MyApplication') 
    .run(appStartup) 
appStartup.$inject = ['$cookieStore', 'AuthService'] 
function appStartup($cookieStore, AuthService)
{
 var token = $cookieStore.get('auth-token')
 if(token){
   AuthService.LoadToken(token) 
  } 
 } 
})();