Very weird error related to modified page contents when using document.write

[bahmutov]

I put the example test into branch https://github.com/cypress-io/cypress-test-tiny/tree/github-static-pages The test just loads a static github page of mine

it('works for website that plays hydration tricks', () => {
  cy.visit('https://glebbahmutov.com')
})

Now that page is a little tricky - it loads Vue app, but it also writes part of the page using document.write to speed up the initial load. Then Vue hydrates the application and it becomes interactive.

First time loading this page in Cypress test runner shows the following error

Weird, isn't it? Then I set "modifyObstructiveCode": false in cypress.json and the website loaded fine.

BUT: when I tried to recreate the issue again and set "modifyObstructiveCode": true the issue would not show up. I removed cached project bundles, still good. Then suddenly it appeared one more time. So there was no reliable way to recreate the problem.

• Mac OS
• Cypress 2.1.0

[bahmutov]

Haha, just went to look at staging api logs and see the same issue in a CI build

[bahmutov]

I wonder if I should have removed certificates to recreate the error, maybe there was a race condition there

[jennifer-shehane]

Cannot recreate this in Cypress version 3.4.0. Closing. Related open issue, however: #1746