floitsch@google.com
8fd6d0aafd
Committed: https://code.google.com/p/dart/source/detail?r=19755 Reverted: http://code.google.com/p/dart/source/detail?r=19756 Review URL: https://codereview.chromium.org//12212016 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@20996 260f80e4-7a28-3924-810f-c04153c831b5
53 lines
2.3 KiB
Dart
53 lines
2.3 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 a coin toss with Random.nextBool() is fair.
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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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var i = 0;
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Expect.equals( 0, rnd.nextInt(1 << ++i));
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Expect.equals( 2, rnd.nextInt(1 << ++i));
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Expect.equals( 7, rnd.nextInt(1 << ++i));
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Expect.equals( 8, rnd.nextInt(1 << ++i));
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Expect.equals( 1, rnd.nextInt(1 << ++i));
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Expect.equals( 61, rnd.nextInt(1 << ++i));
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Expect.equals( 31, rnd.nextInt(1 << ++i));
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Expect.equals( 230, rnd.nextInt(1 << ++i));
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Expect.equals( 390, rnd.nextInt(1 << ++i));
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Expect.equals( 443, rnd.nextInt(1 << ++i));
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Expect.equals( 1931, rnd.nextInt(1 << ++i));
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Expect.equals( 3028, rnd.nextInt(1 << ++i));
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Expect.equals( 5649, rnd.nextInt(1 << ++i));
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Expect.equals( 4603, rnd.nextInt(1 << ++i));
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Expect.equals( 27684, rnd.nextInt(1 << ++i));
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Expect.equals( 54139, rnd.nextInt(1 << ++i));
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Expect.equals( 83454, rnd.nextInt(1 << ++i));
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Expect.equals( 106708, rnd.nextInt(1 << ++i));
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Expect.equals( 112143, rnd.nextInt(1 << ++i));
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Expect.equals( 875266, rnd.nextInt(1 << ++i));
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Expect.equals( 971126, rnd.nextInt(1 << ++i));
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Expect.equals( 1254573, rnd.nextInt(1 << ++i));
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Expect.equals( 4063839, rnd.nextInt(1 << ++i));
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Expect.equals( 7854646, rnd.nextInt(1 << ++i));
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Expect.equals( 29593843, rnd.nextInt(1 << ++i));
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Expect.equals( 17672573, rnd.nextInt(1 << ++i));
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Expect.equals( 80223657, rnd.nextInt(1 << ++i));
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Expect.equals( 142194155, rnd.nextInt(1 << ++i));
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Expect.equals( 31792146, rnd.nextInt(1 << ++i));
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Expect.equals(1042196170, rnd.nextInt(1 << ++i));
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Expect.equals(1589656273, rnd.nextInt(1 << ++i));
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Expect.equals(1547294578, rnd.nextInt(1 << ++i));
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Expect.equals(32, i);
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// If max is too large expect an ArgumentError.
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Expect.throws(() => rnd.nextInt((1 << i)+1), (e) => e is ArgumentError);
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}
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