ui/file_manager/base/js/test_error_reporting.js

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * Invokes a callback function depending on the result of promise.
 *
 * @param {Promise} promise Promise.
 * @param {function(boolean)} callback Callback function. True is passed if the
 *     test failed.
 */
function reportPromise(promise, callback) {
  promise.then(
      () => {
        callback(/* error */ false);
      },
      (/** Error */ error) => {
        console.error(error.stack || error);
        callback(/* error */ true);
      });
}

/**
 * Waits until testFunction becomes true.
 * @param {function(): boolean} testFunction A function which is tested.
 * @return {!Promise} A promise which is fulfilled when the testFunction
 *     becomes true.
 */
function waitUntil(testFunction) {
  const INTERVAL_FOR_WAIT_UNTIL = 100;  // ms

  return new Promise((resolve) => {
    let tryTestFunction = () => {
      if (testFunction())
        resolve();
      else
        setTimeout(tryTestFunction, INTERVAL_FOR_WAIT_UNTIL);
    };

    tryTestFunction();
  });
}