A minimal setup for writing end-to-end tests with Nightwatch. See https://dev.to/kylessg/step-by-step---writing-e2e-tests-for-your-web-project-4mde.
Create a file called .env in the project directory and add a SendGrid API key.
.env
SENDGRID_API_KEY="YOURKEY"
npm i
npm run test:e2e