TDD & Hexagonal Architecture Exercise: Supermarket Checkout Pricer - Part 1

First part of working through the "Supermarket Checkout Pricer" exercise using Test-Driven Development and Hexagonal Architecture. You can find the exercise on GitHub at: https://github.com/tedyoung/supermark..., and the code that I've done so far is on the STREAM branch. This video is from my live coding that you can find on Twitch: http://JitterTed.Stream. Join my Discord to discuss this and other TDD and Software Design topics: https://TED.dev/discord.