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nodejs/test/parallel/test-math-random.js
Ben Noordhuis 5116a6a9b4 tools: make code cache and snapshot deterministic
Use a fixed random seed to ensure that the generated sources are
identical across runs.

The final node binary still reseeds itself on start-up so there should
be no security implications caused by predictable random numbers (e.g.,
`Math.random()`, ASLR, the hash seed, etc.)

Fixes: https://github.com/nodejs/node/issues/29108

PR-URL: https://github.com/nodejs/node/pull/29142
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
2019-08-19 18:03:37 -07:00

18 lines
649 B
JavaScript

'use strict';
require('../common');
const assert = require('assert');
const { spawnSync } = require('child_process');
const results = new Set();
for (let i = 0; i < 10; i++) {
const result = spawnSync(process.execPath, ['-p', 'Math.random()']);
assert.strictEqual(result.status, 0);
results.add(result.stdout.toString());
}
// It's theoretically possible if _very_ unlikely to see some duplicates.
// Therefore, don't expect that the size of the set is exactly 10 but do
// assume it's > 1 because if you get 10 duplicates in a row you should
// go out real quick and buy some lottery tickets, you lucky devil you!
assert(results.size > 1);