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'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)
);
}
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