index.js

const describe = (desc, fn) => {
  console.log(desc)
  fn()
}

const it = (msg, fn) => describe('  ' + msg, fn)

const matchers = (exp) => ({
  toBe: (asssertion) => {
    if (exp === assertion) {
      console.log('pass')
      return true
    } else {
      console.log('fail')
      return false
    }
  }
})

const expect = (exp) => matchers(exp)

function adder(a, b) {
  return a + b 
}

describe('adder', () => {
  it('adds two numbers', () => {
    const result = adder(1, 2)
    expect(result).toBe(3)
  })
})

module.exports = {
  describe,
  expect,
  it,
  matchers
}

Amazing start for a wonderful test framework

asssertion ?

was this testing framework ever executed?

@SumitBando you can just put this in a JS file and run it with Node.js.

If you'd like to learn to build a testing framework with more features, check out this playlist I made.