Set up a basic docker development container

Dockerfile

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+FROM node
+
+ARG NODE_ENV=development
+ENV NODE_ENV $NODE_ENV
+
+WORKDIR /usr/src
+COPY package.json /usr/src
+RUN yarn install && yarn cache clean --force
+ENV PATH /usr/src/node_modules/.bin:$PATH
+ENV NPM_CONFIG_PREFIX /usr/src/node_modules
+
+WORKDIR /usr/src/app
+COPY . /usr/src/app
+
+CMD ["yarn", "test"]

Makefile

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+.PHONY: build test
+
+define compose
+	docker-compose $(1)
+endef
+
+define yarn
+	$(call compose, run dev yarn $1)
+endef
+
+all: build bash
+
+build:
+	$(call compose, build --pull)
+
+bash:
+	$(call compose, run --service-ports dev bash)
+
+test:
+	$(call yarn, $@)

docker-compose.yml

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+version: '2.1'
+
+services:
+  dev:
+    build:
+      context: .
+    volumes:
+      - .:/usr/src/app
+    ports:
+      - "9229:9229"
+      - "3000:3000"

package.json

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+{
+  "name": "@hmcts/look-and-feel",
+  "description": "One question per page apps made easy",
+  "version": "0.0.1",
+  "license": "MIT",
+  "engines": {
+    "node": ">=6.0"
+  },
+  "main": "./src/main.js",
+  "scripts": {
+    "test": "NODE_PATH=. NODE_ENV=testing mocha 'test/**/*.test.js'"
+  },
+  "dependencies": {
+    "express": "^4.15.3",
+    "express-nunjucks": "^2.2.3",
+    "govuk_template_jinja": "^0.22.3",
+    "nunjucks": "^3.0.1"
+  },
+  "devDependencies": {
+    "eslint": "^4.4.0"
+  }
+}