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Cypress fails to run with Chrome in headless mode

See original GitHub issue

Where to find the issue

Cypress Test Suite for cwa-website https://github.com/corona-warn-app/cwa-website/tree/master/cypress

Describe the issue

When running Cypress in headless mode using the Chrome browser, the test times out with the error:

Still waiting to connect to Chrome, retrying in 1 second (attempt 62/62)
Cypress failed to make a connection to the Chrome DevTools Protocol after retrying for 50 seconds.

This usually indicates there was a problem opening the Chrome browser.

The CDP port requested was 51840.

Error: connect ECONNREFUSED 127.0.0.1:51840
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1142:16)

Steps to reproduce

Chrome times out:

npx cypress run --config baseUrl=https://coronawarn.app --spec cypress/integration/mime.js --browser chrome --headless

Electron and Firefox complete successfully

npx cypress run --config baseUrl=https://coronawarn.app --spec cypress/integration/mime.js --browser electron --headless

npx cypress run --config baseUrl=https://coronawarn.app --spec cypress/integration/mime.js --browser firefox --headless

Suggested change

Quick fix:

Comment out the line https://github.com/corona-warn-app/cwa-website/blob/37c86b68cabc829b5ce3758318e7b2cea31bec03/cypress/plugins/index.js#L9

Better fix:

Remove the viewport settings from cypress/plugins/index.js. It looks like they were added when visual comparisons were still part of the Cypress test suite. These were however abandoned a long time ago, so I believe the whole section regarding viewport settings is unnecessary.

Also clean up other related and unused files and folders cypress/integration/__image_snapshots__