56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
'use strict';
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var test = require('tape');
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var crypto = require('../');
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var Buffer = require('safe-buffer').Buffer;
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test('get error message', function (t) {
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try {
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var b = crypto.randomFillSync(Buffer.alloc(10));
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t.ok(Buffer.isBuffer(b));
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t.end();
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} catch (err) {
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t.ok((/not supported/).test(err.message), '"not supported" is in error message');
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t.end();
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}
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});
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test('randomfill', function (t) {
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t.plan(5);
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t.equal(crypto.randomFillSync(Buffer.alloc(10)).length, 10);
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t.ok(Buffer.isBuffer(crypto.randomFillSync(Buffer.alloc(10))));
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crypto.randomFill(Buffer.alloc(10), function (ex, bytes) {
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t.error(ex);
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t.equal(bytes.length, 10);
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t.ok(Buffer.isBuffer(bytes));
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t.end();
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});
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});
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test('seems random', function (t) {
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var L = 1000;
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var buffer = crypto.randomFillSync(Buffer.alloc(L));
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var mean = Array.prototype.reduce.call(buffer, function (a, b) {
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return a + b;
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}, 0) / L;
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// test that the random numbers are plausably random.
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// Math.random() will pass this, but this will catch
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// terrible mistakes such as this blunder:
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// https://github.com/browserify/crypto-browserify/commit/3267955e1df7edd1680e52aeede9a89506ed2464#commitcomment-7916835
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// this doesn't check that the bytes are in a random *order*
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// but it's better than nothing.
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var expected = 256 / 2;
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var smean = Math.sqrt(mean);
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// console.log doesn't work right on testling, *grumble grumble*
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console.log(JSON.stringify([expected - smean, mean, expected + smean]));
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t.ok(mean < expected + smean);
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t.ok(mean > expected - smean);
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t.end();
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});
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