$ npm install --save-dev esm-runner

import TestRunner from 'test-runner'
import assert from 'assert'
import fetch from 'node-fetch'
const tom = new TestRunner.Tom()
tom.test('Math.random() should return a number between 0 and 1', function () {
  const result = Math.random()
  assert.equal(typeof result, 'number')
  assert.ok(result >= 0 && result <= 1)
})
tom.test('REST API should return the current todo item', async function () {
  const response = await fetch('https://jsonplaceholder.typicode.com/todos/1')
  const todo = await response.json()
  assert.equal(todo.userId, 1)
  assert.equal(todo.title, 'delectus aut autem')
})
export default tom