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Side by Side Diff: dart/tests/lib/math/low_test.dart

Issue 11233061: Revert "Parts must start with 'part of'" and "Attempt to fix VM build" (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 8 years, 2 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 // Test that the default PRNG does uniformly distribute values when not using 5 // Test that the default PRNG does uniformly distribute values when not using
6 // a power of 2. 6 // a power of 2.
7 7
8 // Library tag to allow Dartium to run the test. 8 // Library tag to allow Dartium to run the test.
9 library low_test; 9 #library("low_test.dart");
10 10
11 import "dart:math"; 11 #import("dart:math");
12 12
13 void main() { 13 void main() {
14 var n = (2 * (1<<32)) ~/ 3; 14 var n = (2 * (1<<32)) ~/ 3;
15 var n2 = n ~/ 2; 15 var n2 = n ~/ 2;
16 16
17 var iterations = 200000; 17 var iterations = 200000;
18 18
19 var seed = new Random().nextInt((1<<32) - 1); 19 var seed = new Random().nextInt((1<<32) - 1);
20 print("low_test seed: $seed"); 20 print("low_test seed: $seed");
21 var prng = new Random(seed); 21 var prng = new Random(seed);
22 22
23 var low = 0; 23 var low = 0;
24 for (var i = 0; i < iterations; i++) { 24 for (var i = 0; i < iterations; i++) {
25 if (prng.nextInt(n) < n2) { 25 if (prng.nextInt(n) < n2) {
26 low++; 26 low++;
27 } 27 }
28 } 28 }
29 29
30 var diff = (low - (iterations ~/ 2)).abs(); 30 var diff = (low - (iterations ~/ 2)).abs();
31 print("$low, $diff"); 31 print("$low, $diff");
32 Expect.isTrue(diff < (iterations ~/ 20)); 32 Expect.isTrue(diff < (iterations ~/ 20));
33 } 33 }
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