How do you handle HTTP requests in Angular unit tests?

• Use HttpClientTestingModule and HttpTestingController to mock and

control HTTP requests.

Example:

beforeEach(() => {

TestBed.configureTestingModule({

imports: [HttpClientTestingModule]

});

httpTestingController = TestBed.inject(HttpTestingController);

});

it('should call GET API', () => {

service.getData().subscribe(data => {

expect(data).toEqual(mockData);

});

const req = httpTestingController.expectOne('api/data');

expect(req.request.method).toBe('GET');

req.flush(mockData);

httpTestingController.verify();

});