Example of Cypress running end to end tests through Gitlab CI.

.gitlab-ci.yml

image: node:latest

stages:
    - test
    - export
    - deploy

cache:
    paths:
        - node_modules
        - functions/node_modules

end_to_end_tests:
    image: cypress/base:10
    stage: test
    environment: Production
    only:
        - master
    script:
        - npm ci
        - npm install -g firebase-tools
        - firebase use test --token $FIREBASE_KEY
        - npm test
    artifacts:
        expire_in: 1 week
        when: always
        paths:
            - cypress/screenshots
            - cypress/videos

build_static_site:
    stage: export
    environment: Production
    only:
        - master
    script:
        - npm ci
        - npm run export
    artifacts:
        paths:
            - __sapper__/export

firebase_deploy:
    stage: deploy
    environment: Production
    only:
        - master
    script:
        - cd functions && npm install && cd ../
        - npm install -g firebase-tools
        - firebase use production --token $FIREBASE_KEY
        - firebase deploy -m "Pipeline $CI_PIPELINE_ID, build $CI_BUILD_ID" --non-interactive --token $FIREBASE_KEY