octokit-rest/test/mocha-node-setup.js

// non-Cypresss environment (plain Mocha)
// simulate Cypress built-in tools, like sinon-chai

if (!global.cy) {
  const chai = require('chai')
  const sinon = require('sinon')
  const sinonChai = require('sinon-chai')
  chai.use(sinonChai)
  global.expect = chai.expect

  let sandbox
  beforeEach(() => {
    sandbox = sinon.createSandbox()
    global.cy = {
      stub: function () {
        return sandbox.stub.apply(sandbox, arguments)
      },
      log () {
        console.log.apply(console, arguments)
      }
    }
  })

  afterEach(() => {
    sandbox.restore()
  })
}