Test utilities for TypeScript pads on CoderPad

coderPadTSTestUtils.ts

/**
 * You want to use mocha in a TypeScript CoderPad but you get the error
 * message that `describe` isn't defined even though you're already using
 * the `mocha.suite.emit('pre-require', this, 'solution', mocha)` hack?
 *
 * > Cannot find name 'describe'. Do you need to install type definitions
 * > for a test runner? Try `npm i --save-dev @types/jest` or
 * > `npm i --save-dev @types/mocha`.
 * 
 * Here are a couple of lines to copy & paste into your pad to use
 * `describe` and `it`:
 */

const describe = (name: string, cb: Function) => {
  console.log(name);
  console.group();
  cb();
  console.groupEnd();
}

const it = (name: string, cb: Function) => {
  try {
    cb();
    console.log(`✅ ${name}`);
  } catch (e) {
    console.warn(`❌ ${name}`);
    console.error(e);
  }
}

/* Happy coding: */

const { expect } = require('chai')

describe('My suite', () => {
  describe('My nested suite', () => {
    it('resolves successfully', () => {
      expect(true).to.equal(true);
    })

    it('throws an error', () => {
      expect(true).to.equal(false);
    })
  })
})