[🐛 Bug]: Watch mode with Webdriver protocol shows "FetchError" on re-runs

[romaricpascal]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

WebdriverIO Version

8.1.3

Node.js Version

v18.12.1

Mode

WDIO Testrunner

Which capabilities are you using?

https://github.com/alphagov/govuk-frontend/blob/ceeb9a7c6c0c807d8e2eae923b890f26ddebd476/wdio.conf.js

What happened?

When running the wdio test runner in watch mode, re-runs of tests trigger a "TypeError: Failed to fetch browser webSocket URL", preventing the tests to run.

The error is the same as #8279, but occurs in a different context.

What is your expected behavior?

No response

How to reproduce the bug.

1. Checkout https://github.com/alphagov/govuk-frontend/tree/467e25a5f9f20d417d6bec9ed2bff99e67b68b7d (devtools) or https://github.com/alphagov/govuk-frontend/tree/90791a088da2bfa24efb3a89277069fb73ced930 (webdriver)
2. run npm install
3. run npm run wdio -- --watch. This will run the tests a first time
4. run touch src/govuk/components/character-count/character-count.e2e.mjs to trigger a test re-run (if touch is not available on your system, you can open and save the file)

Relevant log output

[0-0] 2023-01-16T11:39:35.733Z ERROR @wdio/runner: TypeError: Failed to fetch browser webSocket URL from http://localhost:50849/json/version: fetch failed

Code of Conduct

• I agree to follow this project's Code of Conduct

Is there an existing issue for this?

• I have searched the existing issues

[christian-bromann]

Thanks for reporting!

Any contributions that resolves the bug are highly appreciated. Please take a look into our contribution guidelines and let us know if you have any questions. Cheers!