circleci config file for node8 and dynamodb on localstack

config.yml

version: 2

references:
  base_container_config: &base_container_config
    docker:
      - image: circleci/node:8
    working_directory: ~/repo

  test_container_config: &test_container_config
    docker:
      - image: circleci/node:8
      - image: localstack/localstack:latest
    environment:
      - DEBUG: 0
      - SERVICES: dynamodb
    working_directory: ~/repo

  restore_repo: &restore_repo
    restore_cache:
      keys:
        - repo-v1-{{ .Branch }}-{{ .Revision }}
        - repo-v1-{{ .Branch }}
        - repo-v1-

  restore_npm_install: &restore_npm_install
    restore_cache:
      keys:
        - node_modules-v1-cache-{{ checksum "package.json" }}
        # fallback to using the latest cache if no exact match is found
        - node_modules-v1-cache

jobs:
  checkout_code:
    <<: *base_container_config
    steps:
      - *restore_repo
      - checkout
      - save_cache:
          key: repo-v1-{{ .Branch }}-{{ .Revision }}
          paths:
            - .

  npm_install:
    <<: *base_container_config
    steps:
      - *restore_repo
      - *restore_npm_install
      - run:
          name: "npm install"
          command: npm install --update-binary
      - save_cache:
          key: node_modules-v1-cache-{{ checksum "package.json" }}
          paths:
            - ./node_modules

  lint:
    <<: *base_container_config
    steps:
      - *restore_repo
      - *restore_npm_install
      - run:
          name: "Linting"
          command: npm run lint -- --format junit -o reports/junit/js-lint-results.xml

  test:
    <<: *test_container_config
    steps:
      - *restore_repo
      - *restore_npm_install
      - run:
          name: "Test suite execution"
          # Because "CredentialsError: Missing credentials in config"
          # AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY and AWS_DEFAULT_REGION are mandatory to access dynamodblocal
          # Set them in circleci project's configuration in "Build settings > Environment Variables"
          command: |
            ./node_modules/jest/bin/jest.js --ci --testResultsProcessor="jest-junit" --collectCoverage --coverageReporters="lcov"
          environment:
            JEST_JUNIT_OUTPUT: "reports/junit/js-test-results.xml"
      - run:
          name: "Report to codecov.io"
          command: ./node_modules/codecov/bin/codecov

      - store_test_results: #along with linting results
          path: reports/junit

      - store_artifacts:
          path: reports/junit

      - store_artifacts:
          path: coverage

workflows:
  version: 2
  main:
    jobs:
      - checkout_code
      - npm_install:
          requires:
            - checkout_code
      - lint:
          requires:
            - npm_install
      - test:
          requires:
            - npm_install

Update with a cleaner version that uses localstack instead of installing dynamodblocal manually each time.