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Viewing file:     testSchedulerHelper.js (1.63 KB)      -rw-r--r--

'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.shouldRunInBand = shouldRunInBand;

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
const SLOW_TEST_TIME = 1000;

function shouldRunInBand(
  tests,
  timings,
  {detectOpenHandles, maxWorkers, watch, watchAll}
) {
  // detectOpenHandles makes no sense without runInBand, because it cannot detect leaks in workers
  if (detectOpenHandles) {
    return true;
  }
  /*
   * Run in band if we only have one test or one worker available, unless we
   * are using the watch mode, in which case the TTY has to be responsive and
   * we cannot schedule anything in the main thread. Same logic applies to
   * watchAll.
   * Also, if we are confident from previous runs that the tests will finish
   * quickly we also run in band to reduce the overhead of spawning workers.
   * Finally, the user can provide the runInBand argument in the CLI to
   * force running in band.
   * https://github.com/facebook/jest/blob/700e0dadb85f5dc8ff5dac6c7e98956690049734/packages/jest-config/src/getMaxWorkers.js#L14-L17
   */

  const isWatchMode = watch || watchAll;
  const areFastTests = timings.every(timing => timing < SLOW_TEST_TIME);
  const oneWorkerOrLess = maxWorkers <= 1;
  const oneTestOrLess = tests.length <= 1;

  if (isWatchMode) {
    return oneWorkerOrLess || (oneTestOrLess && areFastTests);
  }

  return (
    oneWorkerOrLess ||
    oneTestOrLess ||
    (tests.length <= 20 && timings.length > 0 && areFastTests)
  );
}