MAX_POLL_COUNT = 5;

getCount = function() {
  var count = postman.getEnvironmentVariable('__poll_count');
  return (count === undefined) ? 0 : JSON.parse(count);
}

setCount = value => postman.setEnvironmentVariable('__poll_count', JSON.stringify(value));

increment = () => setCount(getCount() + 1);

reset = () => postman.clearEnvironmentVariable('__poll_count');

abort = function() {
    reset();
    postman.setNextRequest(null);
}

maxCountReached = () => getCount() >= MAX_POLL_COUNT;

poll = function(name, predicate) {
    let keepPolling = predicate(response);
    if (maxCountReached()) {
      abort();
    } else if (keepPolling) {
        increment();
      postman.setNextRequest(name);
      new Promise(resolve => setTimeout(resolve, 1000));
    } else {
        reset();
      return true;
    }
}