cy.getCookie() returning null in CI environment

[xtatanx]

I am running Cypress tests through Jenkins and docker-compose using docker/included:10.10.0 image. Locally all tests work, but on the CI environment, specifically the cy.getCookie() command is not retrieving the cookies. I was wondering if there is any consideration when working with tests and cookies through the cypress container. Please find below my docker-compose configuration.

services:
  website:
    build: .
    command: npm run cy:build-and-start
    environment:
      - PORT=8080
    healthcheck:
      test: curl --fail -s http://localhost:8080/ || exit 1
      interval: 1m
      timeout: 10s
      retries: 5
  cypress:
    image: 'cypress/included:10.10.0'
    environment:
      - CYPRESS_baseUrl=http://website:8080
    depends_on:
      website:
        condition: service_healthy
    working_dir: /e2e
    volumes:
      - ./:/e2e

[filiphric]

Cookies are a thing of the browser, not docker container. Without looking at the code it is hard to say, but my guess is that you may run into a problem with cy.getCookie() command and the fact it does not have retryability. There might be a short time between the action that triggers saving cookie into your browser and actually saving it into the browser. So, in cypress open mode, everything passes, but in cypress run mode, or on your CI the test fails, because it goes much faster than on your machine and the cookie gets saved before the cy.getCookie() is called.

one way of how you can solve this is by using .should() command like this:

cy.window().its('document.cookie').should('contain', yourCookie)

the only problem here, is that this will retrieve all browser cookies as a string, so you might need to parse it manually.