gist3.js

import { of, itShouldPath, itShouldProp, equals, allPass, large, less, always } from 'OverAssert';

const data = {
  user: {
    name: 'Alice',
    id: 200
  },
  
  expireTime: 200,
  
  expireDay: 10,

}

of(data)
  .map(itShouldPath(
    ['user', 'name'], 
    equals('Alice'),
    always('user.name should be Alice')
  ))
  .map(itShouldPath(
    ['user', 'id'], 
    large(0), 
    always('user.id should large than 0')
   ))
  .map(itShouldProp(
    'expireTime', 
     less(150), 
     always('expireTime should less than 150')
  ))
  .map(itShouldProp(
    'expireDay', 
     allPass(less(20), large(0)),
     always('expireDay should in range (0, 20)')
  ))
  .validate((success, reason) => {
    // success = false, reason = "expireTime should less than 150"
  })