Mocha - Chai - Ts-node - Typescript - Mocha-Steps

package.json

{
  "scripts": {
    "test:xspec": "npx ts-mocha -p ./test/tsconfig.xspec.json src/**/*.xspec.ts --require mocha-steps"
  },
  "devDependencies": {
    "@types/chai": "^4.3.4",
    "@types/mocha": "^8.0.1",
    "@types/mocha-steps": "^1.3.0",
    "@types/node": "^16.18.11",
    "ts-mocha": "^10.0.0",
    "ts-node": "^10.9.1",
    "ts-node-dev": "^2.0.0",
    "typescript": "^4.9.4",
    "chai": "^4.3.7",
    "proxyquire": "^2.1.3"
  }
}

src - sample-a.ts

import { sampleB } from './sample-b';

export function sampleA(v: string) {
     return sampleB(v+'_sampleA');
}

src - sample-b.ts

console.log('sampleB')
export function sampleB(v: string) {
     return v + '_sampleB';
}

src - sample.ts

import { sampleA } from './sample-a';
console.log('sample')
export function sample(v: string) {
     return sampleA(v + '_sample');
}

src - sample.xspec.ts

import proxyquire from 'proxyquire';
import { expect } from 'chai';
// import sinon from 'sinon';
// Important to prevent proxyquire from going into the original dependency.

/**
 *  Sample.xspec
 *
 * #noCallThru
 *   log => sample
 *
 * #callThru
 *   log => sampleB     <--- notice that will call through, sample-b which is a dependency from sample-a is loaded.
 *   log => sample
 *
 */
describe('Sample.xspec', () => {
     let sample;
     step('noCallThru', () => {
          proxyquire.noCallThru();
          sample = proxyquire('./sample', {
               './sample-a': {
                    sampleA: (v) => {
                         return v + '_____mockSampleA';
                    },
               },
          }).sample;
          expect(sample('a')).to.be.equal('a_sample_____mockSampleA');
     });

     step('callThru', () => {
          proxyquire.callThru();
          sample = proxyquire('./sample', {
               './sample-a': {
                    sampleA: (v) => {
                         return v + '_____mockSampleA';
                    },
               },
          }).sample;
          // console.log({ sample });
          // console.log('#1', sample.sampleA('a'))
          // console.log('#1', sample.sampleA2('a'))
          // expect(sample.sampleA('a')).to.be.undefined;
          expect(sample('a')).to.be.equal('a_sample_____mockSampleA');
     });
});

test - tsconfig.xspec.json

{
     "compilerOptions": {
          "baseUrl": ".",
          "sourceMap": true,
          "declaration": false,
          "module": "CommonJS",
          "moduleResolution": "node16",
          "emitDecoratorMetadata": true,
          "experimentalDecorators": true,
          "target": "ES2020",
          "allowJs": true,
          "removeComments": false,
          "typeRoots": ["*.d.ts", "**/*.d.ts", "../node_modules/@types"],
          "lib": ["dom", "ES2020"],
          "esModuleInterop": true
     },
     "include": ["../src/**/*", "./**/*.ts"],
     "exclude": ["../node_modules"]
}