Test proxy is not working in Github Actions but works locally and on CircleCI with the same config

[bensampaio]

Summary

I'm using Playwright to test my application and I'm using the experimental test proxy for mocking server-side requests. This is working well when I run the tests in dev mode and also on CircleCI. I'm trying to move away from CircleCI to Github Actions but somehow all server-side mocks don't seem to work when running Playwright on Github Actions. So far I don't see any differences in the setup. I can't share any code because this is internal to my company.

Things I tried so far:

• Log the Playwright and Next.js configs: they look the same for CircleCI and Github Actions.
• Add logs inside next.onFetch: in Github Actions these logs are never printed.
• Increase timeouts: nothing changed.
• Start the server with concurrently: at the moment we set Playwright to start the server via webServer.command with next start .... I tried to remove this option and start it with concurrently instead but nothing changed.

Even though I have testProxy: true on the Next.js config it seems the proxy isn't working at all. Everything indicates that server-side requests are not being mocked/intercepted. The docs about the test proxy don't contain much information so I'm out of ideas here but would appreciate some creative ideas/suggestions. Currently, my main question is if there's any kind of logging I could enable for the test proxy? Let me know if you have any more ideas.

Additional information

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Example

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