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52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.shouldRunInBand = shouldRunInBand;
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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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const SLOW_TEST_TIME = 1000;
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function shouldRunInBand(
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tests,
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timings,
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{detectOpenHandles, maxWorkers, watch, watchAll}
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) {
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// detectOpenHandles makes no sense without runInBand, because it cannot detect leaks in workers
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if (detectOpenHandles) {
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return true;
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}
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/*
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* Run in band if we only have one test or one worker available, unless we
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* are using the watch mode, in which case the TTY has to be responsive and
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* we cannot schedule anything in the main thread. Same logic applies to
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* watchAll.
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* Also, if we are confident from previous runs that the tests will finish
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* quickly we also run in band to reduce the overhead of spawning workers.
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* Finally, the user can provide the runInBand argument in the CLI to
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* force running in band.
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* https://github.com/facebook/jest/blob/700e0dadb85f5dc8ff5dac6c7e98956690049734/packages/jest-config/src/getMaxWorkers.js#L14-L17
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*/
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const isWatchMode = watch || watchAll;
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const areFastTests = timings.every(timing => timing < SLOW_TEST_TIME);
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const oneWorkerOrLess = maxWorkers <= 1;
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const oneTestOrLess = tests.length <= 1;
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if (isWatchMode) {
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return oneWorkerOrLess || (oneTestOrLess && areFastTests);
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}
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return (
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oneWorkerOrLess ||
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oneTestOrLess ||
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(tests.length <= 20 && timings.length > 0 && areFastTests)
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);
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}
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