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52 lines
2.0 KiB
52 lines
2.0 KiB
/** |
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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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import { AggregatedResult } from '@jest/test-result'; |
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import { Context } from 'jest-runtime'; |
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import { Test } from 'jest-runner'; |
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declare type Cache = { |
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[key: string]: [0 | 1, number]; |
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}; |
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/** |
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* The TestSequencer will ultimately decide which tests should run first. |
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* It is responsible for storing and reading from a local cache |
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* map that stores context information for a given test, such as how long it |
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* took to run during the last run and if it has failed or not. |
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* Such information is used on: |
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* TestSequencer.sort(tests: Array<Test>) |
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* to sort the order of the provided tests. |
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* |
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* After the results are collected, |
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* TestSequencer.cacheResults(tests: Array<Test>, results: AggregatedResult) |
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* is called to store/update this information on the cache map. |
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*/ |
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export default class TestSequencer { |
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private _cache; |
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_getCachePath(context: Context): string; |
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_getCache(test: Test): Cache; |
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/** |
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* Sorting tests is very important because it has a great impact on the |
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* user-perceived responsiveness and speed of the test run. |
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* |
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* If such information is on cache, tests are sorted based on: |
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* -> Has it failed during the last run ? |
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* Since it's important to provide the most expected feedback as quickly |
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* as possible. |
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* -> How long it took to run ? |
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* Because running long tests first is an effort to minimize worker idle |
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* time at the end of a long test run. |
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* And if that information is not available they are sorted based on file size |
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* since big test files usually take longer to complete. |
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* |
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* Note that a possible improvement would be to analyse other information |
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* from the file other than its size. |
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* |
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*/ |
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sort(tests: Array<Test>): Array<Test>; |
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cacheResults(tests: Array<Test>, results: AggregatedResult): void; |
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} |
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export {}; |
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//# sourceMappingURL=index.d.ts.map
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