gist4.js

import { of, always } from 'OverAssert';

function asyncCheckValidate(value) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (value > 10) {
        resolve();
      } else {
        reject();
      }
    }, 100);
  })
}


of(7)
  .map(itShould(asyncCheckValidate, always('check failed')))
  .validate((success, reason) => {
    // success = false, reason = 'check failed'
  })