blob: ef49367f339a125eae851de2c2e8f7c7af8961ea [file] [log] [blame]
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Test that the secure random generator does not systematically generates
// duplicates. Note that this test is flaky by definition, since duplicates
// can occur. They should be extremely rare, though.
// Library tag to allow Dartium to run the test.
library random_secure;
import "package:expect/expect.dart";
import 'dart:math';
main() {
var results;
var rng0;
var rng1;
var checkInt = (max) {
var intVal0 = rng0.nextInt(max);
var intVal1 = rng1.nextInt(max);
if (max > (1 << 28)) {
Expect.isFalse(results.contains(intVal0));
results.add(intVal0);
Expect.isFalse(results.contains(intVal1));
results.add(intVal1);
}
};
results = [];
rng0 = new Random.secure();
for (var i = 0; i <= 32; i++) {
rng1 = new Random.secure();
checkInt(pow(2, 32));
checkInt(pow(2, 32 - i));
checkInt(1000000000);
}
var checkDouble = () {
var doubleVal0 = rng0.nextDouble();
var doubleVal1 = rng1.nextDouble();
Expect.isFalse(results.contains(doubleVal0));
results.add(doubleVal0);
Expect.isFalse(results.contains(doubleVal1));
results.add(doubleVal1);
};
results = [];
rng0 = new Random.secure();
for (var i = 0; i < 32; i++) {
rng1 = new Random.secure();
checkDouble();
}
var cnt0 = 0;
var cnt1 = 0;
rng0 = new Random.secure();
for (var i = 0; i < 32; i++) {
rng1 = new Random.secure();
cnt0 += rng0.nextBool() ? 1 : 0;
cnt1 += rng1.nextBool() ? 1 : 0;
}
Expect.isTrue((cnt0 > 0) && (cnt0 < 32));
Expect.isTrue((cnt1 > 0) && (cnt1 < 32));
}