How to test different errors?

[ritvik130]

How can I test different errors returned by an endpoint?

I have the following test

  describe('REST fail', () => {

    it('server response 404', async () => {

      const mockAgent = agent.get('https://test.ca');

      mockAgent.intercept({

        method: 'GET',

        path: '/test',

      })

        .reply(404, 'Not Found');

      return assert.isRejected(rest.get('test', 'test'), TypeError, 'fetch failed');

    });

    it('server response 500', async () => {

      const mockAgent = agent.get('https://test.ca');

      mockAgent.intercept({

        method: 'GET',

        path: '/test',

      })

        .reply(500, 'Internal Server Error');

      return assert.isRejected(rest.get('test', 'test'), TypeError, 'fetch failed');

    });

Undici throws TypeError: Fetch Failed for all the different cases, I would like to get a more detailed error, for example, I have this implementation using got:

describe('REST fail', () => {    
    it('server response 404', async () => {
      nock('https://test.ca/')
        .get('/test')
        .reply(404, 'Not Found');
      return assert.isRejected(rest.get('test', 'test'), got.HTTPError, 'Not Found');
    });
    it('server response 500', async () => {
      nock('https://test.ca/')
        .get('/test')
        .reply(500, 'Internal Server Error');
      return assert.isRejected(rest.get('test', 'test'), got.HTTPError, 'Response code 500 (Internal Server Error)');
    });

Thank you for help!

[mcollina]

Would you like to send a PR?

[ritvik130]

@mcollina Sure, I am a relatively new developer working as an intern rn, not sure how to, but if provided with some guidance I would be happy to help.

[ritvik130]

Could you provide some info?

[mcollina]

Unfortunately I don't have a step-by-step guide on how to improve/solve this.