docker-compose.yml

version: '3'
services:
  # if the container exits with 0 immediately run with docker-compose up --build
  web:
    # fix issue where docker container exits with 0 immediately
    stdin_open: true
    # may be required if windows is not detecting file changes in the react app
    #environment:
    #  - CHOKIDAR_USEPOLLING=true
    build: 
      # specify the directory in which our Dockerfile will exist
      context: .
      dockerfile: Dockerfile.dev
    ports:
      - "3000:3000"
    volumes:
      - /app/node_modules
      # map curr dir to the /app dir inside the container
      - .:/app
  tests:
    # fix issue where docker container exits with 0 immediately
    stdin_open: true
    build: 
      # specify the directory in which our Dockerfile will exist
      context: .
      dockerfile: Dockerfile.dev
    volumes:
      - /app/node_modules
      # map curr dir to the /app dir inside the container
      - .:/app
    # overwrite the starting command defined in the Dockerfile.dev
    command: ["npm", "run", "test"]