Mocking API errors doesn't work in 1.20.0

[sorin-davidoi]

What is your Scenario?

Use RequestMock to mock API errors (status code != 200).

What is the Current behavior?

TestCafe throws An unhandled error occurred in the "onResponse" method of the "RequestMock" class: null.

What is the Expected behavior?

The request should be mocked and no error thrown. This used to work in 1.19.0.

What is your public website URL? (or attach your complete example)

https://testcafe.io

What is your TestCafe test code?

import { RequestMock, t } from 'testcafe';

fixture`Demo`;

test
    .page('https://testcafe.io')
    .requestHooks(
        RequestMock()
            .onRequestTo(/d/)
            .respond('', 500)
    )
    ('should pass', async () => {
        await t.wait(1000);
    });

Your complete test report

Demo
 ✖ should pass

   1) An unhandled error occurred in the "onResponse" method of the "RequestMock" class:
      
      null

      Browser: Firefox 102.0 / Linux 0.0

Steps to Reproduce

1. Install testcafe@1.20.0
2. Run testcafe firefox:headless test.ts, observe failure
3. Run with testcafe@1.19.0, observe that the test passes

TestCafe version

1.20.0

Node.js version

v16.14.0

Command-line arguments

testcafe firefox:headless test.ts

Browser name(s) and version(s)

Firefox 102

Platform(s) and version(s)

Fedora 36

Other

Works in 1.19.0.

[Aleksey28]

Hi @sorin-davidoi,

I reproduced the issue. We will update this thread once we have news.