test(env): setup testing environment with jest and docker

setup jest configurations and jest-setup to work with typescript

setup docker-compose to spin up required dependencies such as database and a node container to run the tests in

setup some example tests that use transactions

setup postgres to automatically start with the schema provided

docker-compose.yaml

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+version: '3.8'
+services:
+  api:
+    container_name: hpc_api
+    build:
+      context: .
+      dockerfile: ./env/api/Dockerfile
+    volumes:
+      - .:/srv/www
+    environment:
+      - POSTGRES_CONNECTION_STRING=postgres://postgres:demo@db:5432/demo
+      - NODE_ENV=development
+      - WAIT_HOSTS=db:5432
+      - WAIT_HOSTS_TIMEOUT=120
+    links:
+      - db
+    depends_on:
+      - db
+  db:
+    image: postgres:11.7
+    container_name: hpc_postgres_db
+    environment:
+      - POSTGRES_PASSWORD=demo
+      - POSTGRES_USER=postgres
+      - POSTGRES_DB=demo
+    ports:
+      - 5432:5432
+    volumes:
+      - ./env/db/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d/

env/api/Dockerfile

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+FROM unocha/nodejs:12
+
+RUN apk add -U build-base python3 py-pip
+
+ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.2.1/wait /wait
+RUN chmod +x /wait
+
+RUN rm -rf /etc/services.d/node
+
+COPY ./env/api/node.sh /node.sh
+RUN chmod +x /node.sh
+
+CMD /node.sh

env/api/node.sh

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+#!/usr/bin/with-contenv sh
+
+cd "$NODE_APP_DIR"
+
+if [ ! -d "node_modules" ]; then
+  echo "==> Installing npm dependencies"
+  npm install
+fi
+
+echo "==> Waiting for postgres to start"
+/wait
+
+echo "==> Starting the tests"
+npm run test