在业力/茉莉花测试中模拟角度服务/承诺

Question

我正在尝试编写业力/茉莉花测试,我想了解一些关于模拟如何处理正在返回承诺的服务的解释.我解释一下我的情况:

我有一个控制器,我在其中进行以下调用:

mapService.getMapByUuid(mapUUID, isEditor).then(function(datas){
    fillMapDatas(datas);
});

function fillMapDatas(datas){
    if($scope.elements === undefined){
        $scope.elements = [];
    }
 //Here while debugging my unit test, 'datas' contain the promise javascript object instead //of my real reponse.
   debugger;
    var allOfThem = _.union($scope.elements, datas.elements);

    ...

以下是我的服务方式:

(function () {
'use strict';

var serviceId = 'mapService';

angular.module('onmap.map-module.services').factory(serviceId, [
    '$resource',
    'appContext',
    'restHello',
    'restMap',
    serviceFunc]);

function serviceFunc($resource, appContext, restHello, restMap) {

    var Maps = $resource(appContext+restMap, {uuid: '@uuid', editor: '@editor'});

    return{          
        getMapByUuid: function (uuid, modeEditor) {
            var maps = Maps.get({'uuid' : uuid, 'editor': modeEditor});
            return maps.$promise;
        }
    };
}

})();

最后,这是我的单元测试:

describe('Map controller', function() {
var $scope, $rootScope, $httpBackend, $timeout, createController, MapService, $resource;

beforeEach(module('onmapApp'));

beforeEach(inject(function($injector) {
    $httpBackend = $injector.get('$httpBackend');
    $rootScope = $injector.get('$rootScope');
    $scope = $rootScope.$new();

    var $controller = $injector.get('$controller');

    createController = function() {
        return $controller('maps.ctrl', {
            '$scope': $scope
        });
    };
}));

afterEach(function() {
    $httpBackend.verifyNoOutstandingExpectation();
    $httpBackend.verifyNoOutstandingRequest();
});

var response = {"elements":[1,2,3]};

it('should allow user to get a map', function() {

    var controller = createController();
    $httpBackend.expect('GET', '/onmap/rest/map/MY-UUID?editor=true')
        .respond({
            "success": response
        });


// hope to call /onmap/rest/map/MY-UUID?editor=true url and hope to have response as the fillMapDatas parameter
    $scope.getMapByUUID('MY-UUID', true); 

    $httpBackend.flush();
});
});

我真正想做的是让我的响应对象({"elements:...})作为fillMapDatas函数的datas参数.我不明白如何模拟所有服务事物(服务,承诺,然后)

Answer 1

所以,如果您的服务响应符合预期,您想要测试吗？然后,这是你宁愿在服务上测试的东西.基于单元测试承诺的方法可能如下所示:

var mapService, $httpBackend, $q, $rootScope;

beforeEach(inject(function (_mapService_, _$httpBackend_, _$q_, _$rootScope_) {
  mapService = mapService;
  $httpBackend = _$httpBackend_;
  $q = _$q_;
  $rootScope = _$rootScope_;

  // expect the actual request
  $httpBackend.expect('GET', '/onmap/rest/map/uuid?editor=true');

  // react on that request
  $httpBackend.whenGET('/onmap/rest/map/uuid?editor=true').respond({
    success: {
      elements: [1, 2, 3]
    }
  });
}));

如您所见,您不需要使用$injector,因为您可以直接注入所需的服务.如果你想在整个测试中使用正确的服务名称,你可以用前缀和后缀"_"注入它们,inject()足够聪明,可以识别你的意思.我们还$httpBackend为每个it()规范设置了模拟.我们设置$q并$rootScope供以后处理.

以下是测试服务方法返回承诺的方法:

it('should return a promise', function () {
  expect(mapService.getMapUuid('uuid', true).then).toBeDefined();
});

由于promise总是有一个.then()方法,我们可以检查这个属性,看看它是否是一个promise(当然,其他对象也可以有这个方法).

接下来,您可以测试您使用适当值解析的承诺.您可以设置deferred明确解决的问题.

it('should resolve with [something]', function () {
  var data;

  // set up a deferred
  var deferred = $q.defer();
  // get promise reference
  var promise = deferred.promise;

  // set up promise resolve callback
  promise.then(function (response) {
    data = response.success;
  });

  mapService.getMapUuid('uuid', true).then(function(response) {
    // resolve our deferred with the response when it returns
    deferred.resolve(response);
  });

  // force `$digest` to resolve/reject deferreds
  $rootScope.$digest();

  // make your actual test
  expect(data).toEqual([something]);
});

希望这可以帮助!