1. bitcoin-core のinstall

$ npm install bitcoin-core --save
$ npm install password-hash
$ npm install should --save-dev
$ npm install describe

2. 確認

$ npm ls
user02@ /home/user02
tqq bitcoin-core@4.1.0
tqq describe@1.2.0
tqq password-hash@1.2.2
mqq should@13.2.3

3. client_test.js
Added line 15

const describe = require('describe');