version: 2
jobs:
  build:
    docker:
      - image: node:9-slim
    working_directory: /var/opt/app
    steps:
      - checkout
      - restore_cache:
          name: Restoring cache - node_modules
          keys:
            - node_modules-{{ arch }}-{{ checksum "package.json" }}-{{ checksum "package-lock.json" }}
      - run:
          name: Install packages
          command: npm install
      - save_cache:
          name: Saving cache - node_modules
          key: node_modules-{{ arch }}-{{ checksum "package.json" }}-{{ checksum "package-lock.json" }}
          paths:
            - node_modules
      - run:
          name: mocha
          command: npm run mocha