Jacob Richman
2dcd56ef43
There are far too many files here to review everyone carefully. Spot checking most of the diffs look good as test code is generally written with less care than application code so lots of ugly formatting get through. If people notice files where the automated formatting bothers them feel free to comment indicating file names and I'll move spaces within comments to make the formatting cleaner and use comments to force block formatting as I have done for other case where formatting looked bad. BUG= R=efortuna@google.com Review-Url: https://codereview.chromium.org/2771453003 .
35 lines
870 B
Dart
35 lines
870 B
Dart
// Copyright (c) 2012, 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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// Test that the default PRNG does uniformly distribute values when not using
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// a power of 2.
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// Library tag to allow Dartium to run the test.
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library low_test;
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import "package:expect/expect.dart";
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import 'dart:math';
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void main() {
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var n = (2 * (1 << 32)) ~/ 3;
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var n2 = n ~/ 2;
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var iterations = 200000;
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var seed = new Random().nextInt(1 << 16);
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print("low_test seed: $seed");
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var prng = new Random(seed);
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var low = 0;
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for (var i = 0; i < iterations; i++) {
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if (prng.nextInt(n) < n2) {
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low++;
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}
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}
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var diff = (low - (iterations ~/ 2)).abs();
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print("$low, $diff");
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Expect.isTrue(diff < (iterations ~/ 20));
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}
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