| // Copyright (c) 2013, 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 a coin toss with Random.nextBool() is fair. |
| |
| // Library tag to allow Dartium to run the test. |
| library random_test; |
| |
| import "package:expect/expect.dart"; |
| import 'dart:math'; |
| |
| main() { |
| var rnd = new Random(20130307); |
| // Make sure we do not break the random number generation. |
| var i = 0; |
| Expect.equals( 0, rnd.nextInt(1 << ++i)); |
| Expect.equals( 2, rnd.nextInt(1 << ++i)); |
| Expect.equals( 7, rnd.nextInt(1 << ++i)); |
| Expect.equals( 8, rnd.nextInt(1 << ++i)); |
| Expect.equals( 1, rnd.nextInt(1 << ++i)); |
| Expect.equals( 61, rnd.nextInt(1 << ++i)); |
| Expect.equals( 31, rnd.nextInt(1 << ++i)); |
| Expect.equals( 230, rnd.nextInt(1 << ++i)); |
| Expect.equals( 390, rnd.nextInt(1 << ++i)); |
| Expect.equals( 443, rnd.nextInt(1 << ++i)); |
| Expect.equals( 1931, rnd.nextInt(1 << ++i)); |
| Expect.equals( 3028, rnd.nextInt(1 << ++i)); |
| Expect.equals( 5649, rnd.nextInt(1 << ++i)); |
| Expect.equals( 4603, rnd.nextInt(1 << ++i)); |
| Expect.equals( 27684, rnd.nextInt(1 << ++i)); |
| Expect.equals( 54139, rnd.nextInt(1 << ++i)); |
| Expect.equals( 83454, rnd.nextInt(1 << ++i)); |
| Expect.equals( 106708, rnd.nextInt(1 << ++i)); |
| Expect.equals( 112143, rnd.nextInt(1 << ++i)); |
| Expect.equals( 875266, rnd.nextInt(1 << ++i)); |
| Expect.equals( 971126, rnd.nextInt(1 << ++i)); |
| Expect.equals( 1254573, rnd.nextInt(1 << ++i)); |
| Expect.equals( 4063839, rnd.nextInt(1 << ++i)); |
| Expect.equals( 7854646, rnd.nextInt(1 << ++i)); |
| Expect.equals( 29593843, rnd.nextInt(1 << ++i)); |
| Expect.equals( 17672573, rnd.nextInt(1 << ++i)); |
| Expect.equals( 80223657, rnd.nextInt(1 << ++i)); |
| Expect.equals( 142194155, rnd.nextInt(1 << ++i)); |
| Expect.equals( 31792146, rnd.nextInt(1 << ++i)); |
| Expect.equals(1042196170, rnd.nextInt(1 << ++i)); |
| Expect.equals(1589656273, rnd.nextInt(1 << ++i)); |
| Expect.equals(1547294578, rnd.nextInt(1 << ++i)); |
| Expect.equals(32, i); |
| // If max is too large expect an ArgumentError. |
| Expect.throws(() => rnd.nextInt((1 << i)+1), (e) => e is ArgumentError); |
| } |