在测试AngularJS控制器时,如何在$ http.get承诺中模拟结果？

Question

经过多次阅读后,似乎从AngularJS控制器调用Web服务的推荐方法是使用工厂并从中返回一个promise.

这里我有一个简单的工厂,它调用一个示例API.

myApp.factory('MyFactory', ['$http',function($http) {
var people = {
        requestPeople: function(x) {
            var url = 'js/test.json';
            return $http.get(url);
        }
    };
return people;
}]);

这就是我在控制器中调用它的方式

myApp.controller('MyCtrl1', ['$scope', 'MyFactory', function ($scope, MyFactory) {
        MyFactory.requestPeople(22).then(function(result) {
             $scope.peopleList = result;
        });
}]);

虽然它工作正常,但我希望能够模拟在调用result时传入的then内容.这可能吗？

到目前为止,我的尝试没有产生任 这是我的尝试:

//Fake service
var mockService = {
    requestPeople: function () {
        return {
            then: function () {
                return {"one":"three"};
            }
        }

    }
};


//Some setup
beforeEach(module('myApp.controllers'));
var ctrl, scope;

beforeEach(inject(function ($rootScope, $controller) {
    scope = $rootScope.$new();

    ctrl = $controller('MyCtrl1', { $scope: scope, MyFactory: mockService });
}));

//Test
it('Event Types Empty should default to false', inject(function () {
    expect(scope.peopleList.one).toBe('three');
}));

我在karma运行器中运行时得到的错误是

TypeError:'undefined'不是对象(评估'scope.peopleList.one')

如何使用我的模拟数据进行此测试？

Answer 1

我不认为$ httpBackend就是你在这里所追求的,你想要整个工厂被嘲笑而不依赖于$ http？

看一下$ q,特别是Testing头下的代码示例.您的问题可能会使用如下代码解决:

'use strict';

describe('mocking the factory response', function () {

    beforeEach(module('myApp.controllers'));

    var scope, fakeFactory, controller, q, deferred;

    //Prepare the fake factory
    beforeEach(function () {
        fakeFactory = {
            requestPeople: function () {
                deferred = q.defer();
                // Place the fake return object here
                deferred.resolve({ "one": "three" });
                return deferred.promise;
            }
        };
        spyOn(fakeFactory, 'requestPeople').andCallThrough();
    });

    //Inject fake factory into controller
    beforeEach(inject(function ($rootScope, $controller, $q) {
        scope = $rootScope.$new();
        q = $q;
        controller = $controller('MyCtrl1', { $scope: scope, MyFactory: fakeFactory });
    }));

    it('The peopleList object is not defined yet', function () {
        // Before $apply is called the promise hasn't resolved
        expect(scope.peopleList).not.toBeDefined();
    });

    it('Applying the scope causes it to be defined', function () {
        // This propagates the changes to the models
        // This happens itself when you're on a web page, but not in a unit test framework
        scope.$apply();
        expect(scope.peopleList).toBeDefined();
    });

    it('Ensure that the method was invoked', function () {
        scope.$apply();
        expect(fakeFactory.requestPeople).toHaveBeenCalled();
    });

    it('Check the value returned', function () {
        scope.$apply();
        expect(scope.peopleList).toBe({ "one": "three" });
    });
});

我已经添加了一些关于$ apply的测试,我不知道,直到我开始玩这个!

高格