Show onUnhandledRequest: 'error' in stdout and fail tests

Happy new year & thanks a lot for msw, it’s a fantastic library 🙏

Is your feature request related to a problem? Please describe. I have an app bootstrapped with create-react-app and various tests that I run with Jest. I would like to configure my tests to fail if msw detects any unhandled network request. Hence, I’ve implemented the following configuration:

server.listen({ onUnhandledRequest: 'error' })

Unfortunately, doing so logs the unhandled network request errors to stderr, which the Jest watch mode by default doesn’t show & doesn’t fail the test execution. Hence, I’ve switched back to warn so that I can at least see if any network requests are unhandled when running the tests.

Describe the solution you’d like

1. It would be great if there’s a way to direct the error level to stdout through the options of server.listen
2. Likewise, maybe we could create an additional option for an event handler (e.g. onUnhandledRequestHandler) that one can customise to throw or run process.exit(1) when we encounter an unhandled network request

Additional context

“bypass”	Performs an unhandled request as-is.
“warn”	Prints a warning into stdout of the current process.
“error”	Prints an error into stderr of the current process.

Source: docs

[tobiasbueschel]

Thanks a lot @kettanaito and sorry about the late reply - it’s been rather busy at work! I’ve tried out the fix you’ve published as part of #544 and it’s been working well for me 👏

[kettanaito]

I’ve opened a pull request with the suggestion above (https://github.com/mswjs/msw/pull/544). @tobiasbueschel, could you please check out that PR and use its Codesandbox preview or local build to see if it behaves as you expect now? Thanks.