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packages/jest-core/src/testSchedulerHelper.ts
56 строк
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James Ide
Support workerIdleMemoryLimit=0 to always restart worker child processes between test files (#15740)
22 июл 2025, 05:25
Не верифицирован
22 июл 2025, 05:25
60f6375
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/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ import type {Test} from '@jest/test-result'; import type {Config} from '@jest/types'; const SLOW_TEST_TIME = 1000; export function shouldRunInBand( tests: Array<Test>, timings: Array<number>, { detectOpenHandles, maxWorkers, runInBand, watch, watchAll, workerIdleMemoryLimit, }: Config.GlobalConfig, ): boolean { // If user asked for run in band, respect that. // detectOpenHandles makes no sense without runInBand, because it cannot detect leaks in workers if (runInBand || detectOpenHandles) { return true; } /* * If we are using watch/watchAll mode, don't schedule anything in the main * thread to keep the TTY responsive and to prevent watch mode crashes caused * by leaks (improper test teardown). */ if (watch || watchAll) { return false; } /* * Otherwise, run in band if we only have one test or one worker available. * 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. */ const areFastTests = timings.every(timing => timing < SLOW_TEST_TIME); const oneWorkerOrLess = maxWorkers <= 1; const oneTestOrLess = tests.length <= 1; return ( // When specifying a memory limit, workers should be used workerIdleMemoryLimit === undefined && (oneWorkerOrLess || oneTestOrLess || (tests.length <= 20 && timings.length > 0 && areFastTests)) ); }