Leaf Petersen
b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
61 lines
1.7 KiB
Dart
61 lines
1.7 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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// Test that the secure random generator does not systematically generates
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// duplicates. Note that this test is flaky by definition, since duplicates
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// can occur. They should be extremely rare, though.
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import "package:expect/expect.dart";
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import 'dart:math';
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main() {
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var results;
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var rng0;
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var rng1;
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var checkInt = (max) {
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var intVal0 = rng0.nextInt(max);
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var intVal1 = rng1.nextInt(max);
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if (max > (1 << 28)) {
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Expect.isFalse(results.contains(intVal0));
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results.add(intVal0);
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Expect.isFalse(results.contains(intVal1));
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results.add(intVal1);
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}
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};
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results = [];
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rng0 = new Random.secure();
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for (var i = 0; i <= 32; i++) {
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rng1 = new Random.secure();
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checkInt(pow(2, 32));
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checkInt(pow(2, 32 - i));
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checkInt(1000000000);
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}
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var checkDouble = () {
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var doubleVal0 = rng0.nextDouble();
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var doubleVal1 = rng1.nextDouble();
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Expect.isFalse(results.contains(doubleVal0));
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results.add(doubleVal0);
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Expect.isFalse(results.contains(doubleVal1));
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results.add(doubleVal1);
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};
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results = [];
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rng0 = new Random.secure();
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for (var i = 0; i < 32; i++) {
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rng1 = new Random.secure();
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checkDouble();
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}
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var cnt0 = 0;
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var cnt1 = 0;
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rng0 = new Random.secure();
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for (var i = 0; i < 32; i++) {
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rng1 = new Random.secure();
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cnt0 += rng0.nextBool() ? 1 : 0;
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cnt1 += rng1.nextBool() ? 1 : 0;
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}
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Expect.isTrue((cnt0 > 0) && (cnt0 < 32));
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Expect.isTrue((cnt1 > 0) && (cnt1 < 32));
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}
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