如何“实际”测试Angular 2服务

我是测试API调用的新手 . 我在Angular 2中有这个单元测试代码：

beforeEach(inject([JobListService, MockBackend],
        (testedService: JobListService, mockBackend: MockBackend) => {
        service = testedService;
        backend = mockBackend;

        backend.connections.subscribe((c) => {
            c.mockRespond(new Response(
                new ResponseOptions({body: JSON.stringify(JOBLISTMOCK)})
            ));
        });
    }));

    describe('getAll', () => {
            it('should return jobs', () => {
                service.getAll(1, 10, '0').subscribe(response => {
                    console.log(response.data.length);
                    expect(response.data.data.length).toBeGreaterThan(0);
                });
            });

            it('should return jobs based on company ID', () => {
                service.getAll(1, 10, '26').subscribe(response => {
                    console.log(response.data.data.length);
                    expect(response.data.data.length).toEqual(1);
                });
            });
        });

它有网址结构：http://example.com/api/jobs/1/10/26

第一段和第二段是分页，第三段是公司ID .

我正在测试这个服务功能：

getAll(page: number, pageSize: number, company: string): Observable<any> {
        if (company !== 'null') {
            return this.http.get(`${this.conf.apiUrl}/jobs/companies/get/${page}/${pageSize}/${company}`)
                .map((response: Response) => response.json());
        } else {
            return this.http.get(`${this.conf.apiUrl}/jobs/companies/get/${page}/${pageSize}/0`)
                .map((response: Response) => response.json());
        }
    }

我有这个模拟回复：

{
                    'id': 13,
                    'title': 'Sample Title',
                    'valid_from': '2016-01-01',
                    'valid_to': '2016-02-01',
                    'field_id': '1',
                    'image': '',
                    'description': null,
                    'user_id': 0,
                    'company_id': 26,
                    'created_at': '2017-01-23 14:37:01',
                    'updated_at': '2017-01-23 14:37:01',
                    'fields': {
                        'field_id': 1,
                        'name': 'Respiratory Therapy Technician'
                    }
                },
                {
                    'id': 15,
                    'title': 'Sample Title',
                    'valid_from': '2016-01-01',
                    'valid_to': '2016-02-01',
                    'field_id': '1',
                    'image': 'asd',
                    'description': 'This is my sample des',
                    'user_id': 0,
                    'company_id': 0,
                    'created_at': '2017-01-23 14:37:27',
                    'updated_at': '2017-01-23 14:37:27',
                    'fields': {
                        'field_id': 1,
                        'name': 'Respiratory Therapy Technician'
                    }
                }
}

显然，第二个失败了，因为我的模拟响应被设置为具有0和26作为ID的公司 .

我得到的是我通过mockbackend嘲笑响应但 what I want is to test the function such that getAll() returns only the jobs with company_id 26. 但我的模拟响应是静态的 . 无论如何，我可以制作一个适用于我想要测试的"dynamic mock backend"吗？