Bluebird delay behaviors

delay-test.js

var Promise = require('bluebird');

function test1() {
  return new Promise(function(resolve) {
    setTimeout(function() {
      console.log('resolve');
      resolve(100);
    }, 500);
  });
}

var result = test1().delay(500);

console.log(result.isPending());

setTimeout(function() {
  console.log(result.isPending());
}, 800);

setTimeout(function() {
  console.log(result.isPending());
  console.log(result.value());
}, 1500);

///////////////////////////////////////////////

function test2() {
  return new Promise(function(resolve, reject) {
    setTimeout(function() {
      console.log('reject');
      reject(new Error('failed'));
    }, 500);
  });
}

setTimeout(function() {
  console.log('\n\ntesting reject');

  var result = test2().delay(500);

  console.log(result.isPending());

  setTimeout(function() {
    console.log(result.isPending());
  }, 800);

  setTimeout(function() {
    console.log(result.isPending());
    console.log(result.reason());
  }, 1500);
}, 2000);