lrn@google.com
f0bc9ff077
Simulate the same RNG as the VM when a seed is passed. BUG= http://dartbug.com/15426 R=floitsch@google.com Review URL: https://codereview.chromium.org//104083003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@30893 260f80e4-7a28-3924-810f-c04153c831b5
61 lines
2.6 KiB
Dart
61 lines
2.6 KiB
Dart
// Copyright (c) 2013, 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 rnd.nextInt with a seed generates the same sequence each time.
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// Library tag to allow Dartium to run the test.
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library random_test;
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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 rnd = new Random(20130307);
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// Make sure we do not break the random number generation.
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// If the random algorithm changes, make sure both the VM and dart2js
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// generate the same new sequence.
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var i = 1;
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Expect.equals( 1, rnd.nextInt(i *= 2));
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Expect.equals( 1, rnd.nextInt(i *= 2));
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Expect.equals( 7, rnd.nextInt(i *= 2));
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Expect.equals( 6, rnd.nextInt(i *= 2));
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Expect.equals( 6, rnd.nextInt(i *= 2));
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Expect.equals( 59, rnd.nextInt(i *= 2));
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Expect.equals( 11, rnd.nextInt(i *= 2));
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Expect.equals( 212, rnd.nextInt(i *= 2));
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Expect.equals( 17, rnd.nextInt(i *= 2));
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Expect.equals( 507, rnd.nextInt(i *= 2));
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Expect.equals( 1060, rnd.nextInt(i *= 2));
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Expect.equals( 891, rnd.nextInt(i *= 2));
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Expect.equals( 1534, rnd.nextInt(i *= 2));
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Expect.equals( 8404, rnd.nextInt(i *= 2));
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Expect.equals( 13839, rnd.nextInt(i *= 2));
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Expect.equals( 23298, rnd.nextInt(i *= 2));
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Expect.equals( 53622, rnd.nextInt(i *= 2));
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Expect.equals( 205997, rnd.nextInt(i *= 2));
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Expect.equals( 393823, rnd.nextInt(i *= 2));
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Expect.equals( 514614, rnd.nextInt(i *= 2));
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Expect.equals( 233715, rnd.nextInt(i *= 2));
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Expect.equals( 895357, rnd.nextInt(i *= 2));
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Expect.equals( 4726185, rnd.nextInt(i *= 2));
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Expect.equals( 7976427, rnd.nextInt(i *= 2));
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Expect.equals( 31792146, rnd.nextInt(i *= 2));
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Expect.equals( 35563210, rnd.nextInt(i *= 2));
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Expect.equals( 113261265, rnd.nextInt(i *= 2));
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Expect.equals( 205117298, rnd.nextInt(i *= 2));
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Expect.equals( 447729735, rnd.nextInt(i *= 2));
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Expect.equals(1072507596, rnd.nextInt(i *= 2));
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Expect.equals(2134030067, rnd.nextInt(i *= 2));
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Expect.equals( 721180690, rnd.nextInt(i *= 2));
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Expect.equals(0x100000000, i);
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// If max is too large expect an ArgumentError.
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Expect.throws(() => rnd.nextInt(i + 1), (e) => e is ArgumentError);
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rnd = new Random(6790);
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Expect.approxEquals(0.7360144236, rnd.nextDouble());
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Expect.approxEquals(0.3292339731, rnd.nextDouble());
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Expect.approxEquals(0.3489622548, rnd.nextDouble());
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Expect.approxEquals(0.9815975892, rnd.nextDouble());
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}
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