The book uses two projects:
Contains code for each code listing by name. Each one of them runs as its own, isolated unit test.
npm test src/ch02/2-1.js
Or run all:
npm test src/ch02/2-1.js
Builds pieces of a simple blockchain, transaction management system. You can run each test individually:
npm test test/TransferFunds.spec.js
Or run all:
npm run test-all