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

Issue 11358203: Library syntax updates. Covers all remaining files in ~/tests aprt from ~/tests/language and ~/test… (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 1 month 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 a coin toss with Random.nextBool() is fair. 5 // Test that a coin toss with Random.nextBool() is fair.
6 6
7 // Library tag to allow Dartium to run the test. 7 // Library tag to allow Dartium to run the test.
8 #library("coin_test"); 8 library coin_test;
9 9
10 #import("dart:math"); 10 import 'dart:math';
11 11
12 main() { 12 main() {
13 var seed = new Random().nextInt((1<<32) - 1); 13 var seed = new Random().nextInt((1<<32) - 1);
14 print("coin_test seed: $seed"); 14 print("coin_test seed: $seed");
15 var rnd = new Random(); 15 var rnd = new Random();
16 var heads = 0; 16 var heads = 0;
17 var tails = 0; 17 var tails = 0;
18 for (var i = 0; i < 10000; i++) { 18 for (var i = 0; i < 10000; i++) {
19 if (rnd.nextBool()) { 19 if (rnd.nextBool()) {
20 heads++; 20 heads++;
21 } else { 21 } else {
22 tails++; 22 tails++;
23 } 23 }
24 } 24 }
25 print("Heads: $heads\n" 25 print("Heads: $heads\n"
26 "Tails: $tails\n" 26 "Tails: $tails\n"
27 "Ratio: ${heads/tails}\n"); 27 "Ratio: ${heads/tails}\n");
28 Expect.approxEquals(1.0, heads/tails, 0.1); 28 Expect.approxEquals(1.0, heads/tails, 0.1);
29 } 29 }
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