Sample Circle ci config to deploy a node application in heroku and run integration tests before and after release using cypress

config.yml

# .circleci/config.yml
version: 2
defaults: &defaults
  working_directory: ~/app
  docker:
    # the Docker image with Cypress dependencies
    - image: cypress/base:8
      environment:
        ## this enables colors in the output
        TERM: xterm
jobs:
  build:
    <<: *defaults
    steps:
      - checkout
      - restore_cache:
          key: v2-deps-{{ .Branch }}-{{ checksum "package-lock.json" }}
          key: v2-deps-{{ .Branch }}
          key: v2-deps
      - run:
          name: Install Dependencies
          command: npm install
      - save_cache:
          key: v2-deps-{{ .Branch }}-{{ checksum "package-lock.json" }}
          paths:
            - node_modules
            - ~/.npm
            - ~/.cache
      - run:
          name: Run Tests
          command: npm run ci
      - store_test_results:
          path: results
      - store_artifacts:
          path: cypress/screenshots
  deploy:
    <<: *defaults
    steps:
      - checkout
      - restore_cache:
          key: v2-deps-{{ .Branch }}-{{ checksum "package-lock.json" }}
          key: v2-deps-{{ .Branch }}
          key: v2-deps
      - run:
          name: Deploy Master to Heroku
          command: |
            git push https://heroku:$HEROKU_API_KEY@git.heroku.com/$HEROKU_APP.git master --force
      - run:
          name: Run tests on Staging Server
          command: npm run cy-test -- --config=baseUrl=https://$HEROKU_APP.herokuapp.com/en
      - store_test_results:
          path: results
      - store_artifacts:
          path: cypress/screenshots
workflows:
  version: 2
  build-deploy:
    jobs:
      - build
      - deploy:
          requires:
            - build
          filters:
            branches:
              only: master