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node_modules/crypto-browserify/test/random-bytes.js

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+'use strict';
+
+var test = require('tape');
+var crypto = require('../');
+var randomBytes = require('randombytes');
+var entries = require('object.entries');
+
+var randomBytesFunctions = {
+	randomBytes: randomBytes,
+	pseudoRandomBytes: crypto.pseudoRandomBytes
+};
+
+// Both randomBytes and pseudoRandomBytes should provide the same interface
+entries(randomBytesFunctions).forEach(function (entry) {
+	var randomBytesName = entry[0];
+	var randomBytesFn = entry[1];
+
+	test('get error message', function (t) {
+		try {
+			var b = randomBytesFn(10);
+			t.ok(Buffer.isBuffer(b));
+			t.end();
+		} catch (err) {
+			t.ok((/not supported/).test(err.message), '"not supported" is in error message');
+			t.end();
+		}
+	});
+
+	test(randomBytesName, function (t) {
+		t.plan(5);
+		t.equal(randomBytesFn(10).length, 10);
+		t.ok(Buffer.isBuffer(randomBytesFn(10)));
+		randomBytesFn(10, function (ex, bytes) {
+			t.error(ex);
+			t.equal(bytes.length, 10);
+			t.ok(Buffer.isBuffer(bytes));
+			t.end();
+		});
+	});
+
+	test(randomBytesName + ' seem random', function (t) {
+		var L = 1000;
+		var buffer = randomBytesFn(L);
+
+		var mean = Array.prototype.reduce.call(buffer, function (a, b) { return a + b; }, 0) / L;
+
+		// test that the random numbers are plausably random.
+		// Math.random() will pass this, but this will catch
+		// terrible mistakes such as this blunder:
+		// https://github.com/browserify/crypto-browserify/commit/3267955e1df7edd1680e52aeede9a89506ed2464#commitcomment-7916835
+
+		// this doesn't check that the bytes are in a random *order*
+		// but it's better than nothing.
+
+		var expected = 256 / 2;
+		var smean = Math.sqrt(mean);
+
+		// console.log doesn't work right on testling, *grumble grumble*
+		console.log(JSON.stringify([expected - smean, mean, expected + smean]));
+		t.ok(mean < expected + smean);
+		t.ok(mean > expected - smean);
+
+		t.end();
+	});
+});