- Extend the coin test for slightly different scenarios.

tests/lib/math/random_test.dart

 // 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(         1, rnd.nextInt(1 << ++i));
+  Expect.equals(         1, 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(         6, rnd.nextInt(1 << ++i));
+  Expect.equals(         6, rnd.nextInt(1 << ++i));
+  Expect.equals(        59, rnd.nextInt(1 << ++i));
+  Expect.equals(        11, rnd.nextInt(1 << ++i));
+  Expect.equals(       212, rnd.nextInt(1 << ++i));
+  Expect.equals(        17, rnd.nextInt(1 << ++i));
+  Expect.equals(       507, rnd.nextInt(1 << ++i));
+  Expect.equals(      1060, rnd.nextInt(1 << ++i));
+  Expect.equals(       891, rnd.nextInt(1 << ++i));
+  Expect.equals(      1534, rnd.nextInt(1 << ++i));
+  Expect.equals(      8404, rnd.nextInt(1 << ++i));
+  Expect.equals(     13839, rnd.nextInt(1 << ++i));
+  Expect.equals(     23298, rnd.nextInt(1 << ++i));
+  Expect.equals(     53622, rnd.nextInt(1 << ++i));
+  Expect.equals(    205997, rnd.nextInt(1 << ++i));
+  Expect.equals(    393823, rnd.nextInt(1 << ++i));
+  Expect.equals(    514614, rnd.nextInt(1 << ++i));
+  Expect.equals(    233715, rnd.nextInt(1 << ++i));
+  Expect.equals(    895357, rnd.nextInt(1 << ++i));
+  Expect.equals(   4726185, rnd.nextInt(1 << ++i));
+  Expect.equals(   7976427, 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(  35563210, rnd.nextInt(1 << ++i));
+  Expect.equals( 113261265, rnd.nextInt(1 << ++i));
+  Expect.equals( 205117298, rnd.nextInt(1 << ++i));
+  Expect.equals( 447729735, rnd.nextInt(1 << ++i));
+  Expect.equals(1072507596, rnd.nextInt(1 << ++i));
+  Expect.equals(2134030067, rnd.nextInt(1 << ++i));
+  Expect.equals(721180690, 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);
 }