Question

我有服务：

angular.module('driveby').factory('BuildingsService', function(Restangular) {
    var buildings = [];

    var fetchBuildings = function() {
        return Restangular.all('buildings').getList();
    };

    var getBuildings = function() {
        return buildings;
    };

    return {
        getBuildings: getBuildings,
        fetchBuildings: fetchBuildings
    };
});

我正在尝试使用Jasmine进行单元测试，但承诺永远不会解决：

describe('BuildingsService', function () {
   var BuildingsService, httpBackend;
   var buildingsUrl = '/api/buildings';
   var mockBuildings = [
       {id: 1},
       {id: 2},
       {id: 3}
   ];

   beforeEach(module('driveby'));

   beforeEach(inject(function($httpBackend) {
       httpBackend = $httpBackend;
       httpBackend.whenGET(buildingsUrl).respond(
           JSON.stringify(mockBuildings)
       );
    }));

   beforeEach(inject(function(_BuildingsService_) {
       BuildingsService = _BuildingsService_;
   }));

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

   it('can fetch the list of buildings from the API', function() {
       expect(BuildingsService.getBuildings().length).toEqual(0);

       httpBackend.expectGET(buildingsUrl);

       BuildingsService.fetchBuildings().then(function(buildings) {
           expect(buildings.length).toEqual(3);
       });

       httpBackend.flush();

       expect(BuildingsService.getBuildings().length).toEqual(3);
   });
});

问题是该行永远不会在测试中执行：

expect(buildings.length).toEqual(3);

API路由是正确的，没有未完成的请求，但httpFlush没有解决Restangular的承诺。此行应该通过，但它返回0而不是3：

expect(BuildingsService.getBuildings().length).toEqual(3);

有人在这里看到了什么问题吗？

Answer 1

承诺内部回调不起作用。测试这样的promises的正确方法是将返回值分配给promise的范围之外的变量。

您的第二个期望是返回0，因为您的服务的fetchBuildings（）没有将buildings数组设置为API调用的结果;它只是回来了。您应该将该赋值添加到函数中，或者在测试中创建一个给出API调用返回值的变量，然后使用expect（）进行检查;

承诺不会在Restangular服务单元测试中解决

1 个答案: