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Reproduction

  1. yarn install or npm install
  2. node start-server
  3. In a different terminal, run the tests (via cypress open or cypress run); the tests will fail
  4. Downgrade to cypress 12.14
  5. Run the tests again; the tests will pass

start-server.js

This runs a simple HTTP + WebSocket server on port 3000. The server is extremely minimal.

Details

Our tests run a Web Worker via:

const blob = new Blob([webWorkerScript], {type: 'application/javascript'});
const workerURL = URL.createObjectURL(blob);

(We run a WebSocket inside that worker, but I do not believe that is relevant to this issue. I have preserved that in this replication, just in case it is relevant. However, a lot of irrelevant details about our specific system have been stripped out.)

Note that the web worker runs in the tests, not in the application under test.

Prior to cypress 12.15 this worked fine. In cypress 12.15 or later, it does not work.

Note that there is an error in the console log that may be illluminating:

spec.cy.js:36 Refused to create a worker from 'blob:http://localhost:3000/164681fb-cb4d-414b-8d35-2821c8805feb' because it violates the following Content Security Policy directive: "script-src 'unsafe-eval'". Note that 'worker-src' was not explicitly set, so 'script-src' is used as a fallback.

Our assumption is that the changes made related to cypress-io/cypress#1030 are what caused this.

Note that we have tried using the experimentalCspAllowList option and that has not addressed the issue, e.g.:

  "experimentalCspAllowList": ['script-src-elem', 'script-src', 'default-src', 'form-action', 'child-src', 'frame-src']