cy-screenshot-timeout

Minimal repro of cy.screenshot timeout/hang as discussed in issue 5016.

The symptom

On Windows, cypress test failures cannot take screenshots, instead, they timeout after 30 seconds (or, seen outside this repro, crash cypress w/error code 3221225477, evidently an access violation).

The timeout occurs frequently, but not 100% of the time.

This repo demonstrates the timeout:

CypressError: `cy.screenshot()` timed out waiting `30000ms` to complete.

...this also seems to prevent cypress from exiting normally.

Environment to repro

• Windows
• Cypress 9.2.1 (and older, according to the aforementioned GH issue)
• headless mode
• built-in electron browser
• Node 12, 14, or 16

Running the demo

After installing the dependencies via npm i, to run the demo, simply run npm start.

This demo is created from the default "cypress" folder that a fresh installation gives you the first time you open cypress. I removed the demo tests so there is only a single file repro.spec.js that should be executed.

Please note that the cypress run command here uses the recently released CYPRESS_VERIFY_TIMEOUT env var as we have found that necessary to run cypress the first time on new machines.

Observations

• a simple cy.screenshot() call (not associated with a failure) will work, AND will prevent subsequent failing assertions from timing out on their screenshots (?)
• enabling video, using a cypress.json config setting of video w/a value of true will (oddly) prevent the timeouts, which I learned from the aforementioned GH issue, specifically this comment.
• disabling failure screenshots altogether with a cypress.json config setting of screenshotOnRunFailure w/a value of false will prevent the timeouts
• if you enable DEBUG=cypress:*, the timeout occurs less frequently for some reason, but when/if it DOES timeout, you will see the last trace line before the timeout as

  cypress:server:browsers:electron debugger: sending Page.captureScreenshot with params { format: 'png' }