An example for Clouseau

clouseau-ex.js

var clouseau = require('clouseau-js');
    
function alertCheck(page) {
  var dfd = this; // `this` is a deferred! \o/
  page.onAlert = function (txt) {
    if (txt !== 'MY EXPECTED MESSAGE') {
      return dfd.reject(new Error("Unexpected message: " + txt));
    }
    return dfd.resolve(page);
  };
};

var check1 = clouseau.addCheckpoint(alertCheck, 10000); // timeout in ms

clouseau.start("http://your.domain.com/end/point")
  .then(check1)
  .then(function () { console.log('OK'); }, function () { console.log('Fail'); });