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51 lines
1.6 KiB
51 lines
1.6 KiB
'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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