/
TestSequencer.ts
111 lines (98 loc) · 3.54 KB
/
TestSequencer.ts
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/**
* 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.
*/
import fs from 'fs';
import {AggregatedResult} from '@jest/test-result';
import {getCacheFilePath} from 'jest-haste-map';
import {Context} from 'jest-runtime';
import {Test} from 'jest-runner';
const FAIL = 0;
const SUCCESS = 1;
type Cache = {
[key: string]: [0 | 1, number];
};
export default class TestSequencer {
private _cache: Map<Context, Cache>;
constructor() {
this._cache = new Map();
}
_getCachePath(context: Context) {
const {config} = context;
return getCacheFilePath(config.cacheDirectory, 'perf-cache-' + config.name);
}
_getCache(test: Test) {
const {context} = test;
if (!this._cache.has(context) && context.config.cache) {
const cachePath = this._getCachePath(context);
if (fs.existsSync(cachePath)) {
try {
this._cache.set(
context,
JSON.parse(fs.readFileSync(cachePath, 'utf8')),
);
} catch (e) {}
}
}
let cache = this._cache.get(context);
if (!cache) {
cache = {};
this._cache.set(context, cache);
}
return cache;
}
// When running more tests than we have workers available, sort the tests
// by size - big test files usually take longer to complete, so we run
// them first in an effort to minimize worker idle time at the end of a
// long test run.
//
// After a test run we store the time it took to run a test and on
// subsequent runs we use that to run the slowest tests first, yielding the
// fastest results.
sort(tests: Array<Test>): Array<Test> {
const stats: {[path: string]: number} = {};
const fileSize = ({path, context: {hasteFS}}: Test) =>
stats[path] || (stats[path] = hasteFS.getSize(path) || 0);
const hasFailed = (cache: Cache, test: Test) =>
cache[test.path] && cache[test.path][0] === FAIL;
const time = (cache: Cache, test: Test) =>
cache[test.path] && cache[test.path][1];
tests.forEach(test => (test.duration = time(this._getCache(test), test)));
return tests.sort((testA, testB) => {
const cacheA = this._getCache(testA);
const cacheB = this._getCache(testB);
const failedA = hasFailed(cacheA, testA);
const failedB = hasFailed(cacheB, testB);
const hasTimeA = testA.duration != null;
if (failedA !== failedB) {
return failedA ? -1 : 1;
} else if (hasTimeA != (testB.duration != null)) {
// If only one of two tests has timing information, run it last
return hasTimeA ? 1 : -1;
} else if (testA.duration != null && testB.duration != null) {
return testA.duration < testB.duration ? 1 : -1;
} else {
return fileSize(testA) < fileSize(testB) ? 1 : -1;
}
});
}
cacheResults(tests: Array<Test>, results: AggregatedResult) {
const map = Object.create(null);
tests.forEach(test => (map[test.path] = test));
results.testResults.forEach(testResult => {
if (testResult && map[testResult.testFilePath] && !testResult.skipped) {
const cache = this._getCache(map[testResult.testFilePath]);
const perf = testResult.perfStats;
cache[testResult.testFilePath] = [
testResult.numFailingTests ? FAIL : SUCCESS,
perf.end - perf.start || 0,
];
}
});
this._cache.forEach((cache, context) =>
fs.writeFileSync(this._getCachePath(context), JSON.stringify(cache)),
);
}
}