Make chai and jest be friends

jest.config.cjs

// make directories for 'tests' and 'src'.
// put this file in the base of your project;
// put all of your code in ./src and all of your tests in ./tests.

module.exports = {

  roots: [
    'tests',
    'src',
  ],

  // The glob patterns Jest uses to detect test files -- put all your files in 
  testMatch: ["**/*.test.[tj]s?(x)"],

  // A list of paths to modules that run some code to configure or set up the testing framework before each test
  setupFilesAfterEnv: ['./tests/setupFilesAfterEnv.js'],
  
}

tests_setupFilesAfterEnv.js

// put this in tests/setupFilesAfterEnv.js 
import Chai                             from 'chai'
import ChaiAsPromised                   from 'chai-as-promised'

Chai.use(ChaiAsPromised) // must be last
global.expect = Chai.expect
Error.stackTraceLimit = 50