Javascript 用茉莉花测试嵌套的AngularJS承诺

我希望测试嵌套的承诺，但我不确定如何进行

我如何测试这样的场景

angular.module('moduleA')
   .factory('serviceA', function(serviceB){

  return {
      create: create
  }

  function create(){

    return serviceB.create().then(function(d){

        serviceB.doSomething();

        return $state.go("app.list", { id: d.id }).then(function(){

            serviceB.doSomethingElse();

        });

    })

  };
}); 

我想在哪里测试

    expect(serviceB, 'create').toHaveBeenCalled();
    expect($state, 'go').toHaveBeenCalledWith("app.list", { id: newId });
    expect(serviceB, 'doSomething').toHaveBeenCalled();
    expect(serviceB, 'doSomethingElse').toHaveBeenCalled();

以下是我的尝试：

describe('serviceA spec', function () {

var $rootScope, $state, serviceA, serviceB;

beforeEach(function () {

    $state = {
        go: function(){}
    }

    serviceB = {
        create: {},
        doSomething: {},
        doSomethingElse: {}
    }

    module('app', function($provide){
        $provide.value('serviceB', serviceB);
        $provide.value('$state', $state);
    });

    inject(function (_$rootScope_, _serviceA_) {
        serviceA =_serviceA_;
        $rootScope = _$rootScope_;
    });
});

it('should create', function(){

    var newId = "555";

    spyOn($state, 'go').and.callFake(function () {
        var deferred = $q.defer();
        deferred.resolve({});
        return deferred.promise;
    });

    spyOn(serviceB, 'create').and.callFake(function () {
        var deferred = $q.defer();
        deferred.resolve({ id: newId });
        return deferred.promise;
    });

    spyOn(serviceB, 'doSomething');
    spyOn(serviceB, 'doSomethingElse');

    serviceA.create();

    expect(serviceB, 'create').toHaveBeenCalled();
    expect($state, 'go').toHaveBeenCalledWith("app.list", { id: newId });
    expect(serviceB, 'doSomething').toHaveBeenCalled();
    expect(serviceB, 'doSomethingElse').toHaveBeenCalled();

    $rootScope.$digest();

});

});

---

如果您在每次承诺后都必须调用

$rootScope.$apply（）

，我们将非常感谢您提供的任何建议，以确保承诺得到充分履行