How do I test Angular interceptors?

How do I test Angular interceptors?

To test Angular interceptors, you can use Jasmine and TestBed to create a testing module.

Can you show me a code example?

Sure! Here's a simple example of testing an interceptor:

import { TestBed } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { MyInterceptor } from './my-interceptor';

describe('MyInterceptor', () => {
  let httpMock: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [MyInterceptor]
    });
    httpMock = TestBed.inject(HttpTestingController);
  });

  it('should intercept requests', () => {
    // Your test logic here
  });
});

What should I include in the test logic?

In the test logic, you should check if the interceptor modifies the request as expected and handles responses correctly.

Are there any best practices for testing interceptors?

Yes, ensure to test both success and error scenarios, and keep your tests isolated and focused on one aspect at a time.