How to "Actually" Test an Angular 2 Service - api

Question

I am new to testing calls to an API. I have this unit test code in Angular 2:
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);
});
});
});
it has the url structure:
http://example.com/api/jobs/1/10/26
where first and second segment is pagination and the 3rd segment is a company ID.
I am testing this service function:
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());
}
}
I have this mock response:
{
'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'
}
}
}
the 2nd one fails, obviously, because my mock response is set to companies that have 0 and 26 as IDs.
I get that I am mocking a response via a mockbackend but what I want is to test the function such that getAll() returns only the jobs with company_id 26. But my mock response is static. Is there anyway that I can make a "dynamic mock backend" that will work with what I want to test?