example CI using selenium with firefox driver

gitlab-ci.yml

image: python:3.7

stages:
  - test
  - deploy

development:
    stage: test
    before_script:
        - pip install -r requirements.txt
        - python manage.py collectstatic --no-input
        - python manage.py migrate
    when: on_success
    script:
        - coverage run --omit='manage.py' manage.py test --parallel --reverse
        - coverage report -m

deploy_staging:
    stage: deploy
    before_script:
        - apt -qq update
        - DEBIAN_FRONTEND=noninteractive apt -qq -y install xvfb firefox-esr 
        # download geckodriver as no distro offers a package
        - apt install -qq -y jq  # I don't want to parse JSON with regexes
        - curl -s https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r '.assets[].browser_download_url | select(contains("linux64"))' | xargs -n1 curl -sL | tar -xz -C /usr/local/bin
        - chmod +x /usr/local/bin/geckodriver
        # prepare Django installation
        - python -m venv /opt/testing
        # bundled pip and setuptools are outdated
        - /opt/testing/bin/pip install --quiet --upgrade pip setuptools
        - /opt/testing/bin/pip install --quiet -r requirements.txt
        
        # deploy to heroku
        - apt-get install -y ruby-dev
        - gem install dpl
        - wget -qO- https://cli-assets.heroku.com/install-ubuntu.sh | sh
    when: on_success
    allow_failure: false
    script:
        - dpl --provider=heroku --app=$HEROKU_NAME --api-key=$HEROKU_API_KEY_STAGING
        - export HEROKU_API_KEY=$HEROKU_API_KEY_STAGING
        - heroku run --app $HEROKU_NAME migrate &
        - xvfb-run /opt/testing/bin/python manage.py test functional_test.new_visitor_test        
    environment:
        name: heroku
        url: $HEROKU_HOST