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test_runner: run single test file benchmark #56479

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62 changes: 62 additions & 0 deletions benchmark/test_runner/run-single-test-file.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
'use strict';
const common = require('../common');

const tmpdir = require('../../test/common/tmpdir');
const { run } = require('node:test');
const { writeFileSync, mkdirSync } = require('node:fs');
const { join } = require('node:path');

const fixtureContent = "const test = require('node:test'); test('test has ran');";

function makeTestDirWithFiles(dirPath, count) {
mkdirSync(dirPath);
for (let i = 0; i < count; i++) {
writeFileSync(join(dirPath, `test-${i}.js`), fixtureContent);
}
}

function getTestDirPath(numberOfTestFiles) {
return join(tmpdir.path, `${numberOfTestFiles}-tests`);
}

function setup(numberOfTestFiles) {
tmpdir.refresh();
const dirPath = getTestDirPath(numberOfTestFiles);
makeTestDirWithFiles(dirPath, numberOfTestFiles);
}

/**
* This benchmark evaluates the overhead of running a single test file under different
* isolation modes.
* Specifically, it compares the performance of running tests in the
* same process versus creating multiple processes.
*/
const bench = common.createBenchmark(main, {
numberOfTestFiles: [1, 10, 100],
isolation: ['none', 'process'],
}, {
// We don't want to test the reporter here
flags: ['--test-reporter=./benchmark/fixtures/empty-test-reporter.js'],
});

async function runBenchmark({ numberOfTestFiles, isolation }) {
const dirPath = getTestDirPath(numberOfTestFiles);
const stream = run({
cwd: dirPath,
isolation,
concurrency: false, // We don't want to run tests concurrently
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});

// eslint-disable-next-line no-unused-vars
for await (const _ of stream);

return numberOfTestFiles;
}

function main(params) {
setup(params.numberOfTestFiles);
bench.start();
runBenchmark(params).then(() => {
bench.end(1);
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});
}
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