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

Issue 2771453003: Format all tests. (Closed)
Patch Set: Format files Created 3 years, 8 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 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 "package:expect/expect.dart"; 10 import "package:expect/expect.dart";
11 import 'dart:math'; 11 import 'dart:math';
12 12
13 main() { 13 main() {
14 var seed = new Random().nextInt(1<<16); 14 var seed = new Random().nextInt(1 << 16);
15 print("coin_test seed: $seed"); 15 print("coin_test seed: $seed");
16 var rnd = new Random(seed); 16 var rnd = new Random(seed);
17 var heads = 0; 17 var heads = 0;
18 var tails = 0; 18 var tails = 0;
19 for (var i = 0; i < 10000; i++) { 19 for (var i = 0; i < 10000; i++) {
20 if (rnd.nextBool()) { 20 if (rnd.nextBool()) {
21 heads++; 21 heads++;
22 } else { 22 } else {
23 tails++; 23 tails++;
24 } 24 }
25 } 25 }
26 print("Heads: $heads\n" 26 print("Heads: $heads\n"
27 "Tails: $tails\n" 27 "Tails: $tails\n"
28 "Ratio: ${heads/tails}\n"); 28 "Ratio: ${heads/tails}\n");
29 Expect.approxEquals(1.0, heads/tails, 0.1); 29 Expect.approxEquals(1.0, heads / tails, 0.1);
30 30
31 heads = 0; 31 heads = 0;
32 tails = 0; 32 tails = 0;
33 for (var i = 0; i < 10000; i++) { 33 for (var i = 0; i < 10000; i++) {
34 rnd = new Random(i); 34 rnd = new Random(i);
35 if (rnd.nextBool()) { 35 if (rnd.nextBool()) {
36 heads++; 36 heads++;
37 } else { 37 } else {
38 tails++; 38 tails++;
39 } 39 }
40 } 40 }
41 print("Heads: $heads\n" 41 print("Heads: $heads\n"
42 "Tails: $tails\n" 42 "Tails: $tails\n"
43 "Ratio: ${heads/tails}\n"); 43 "Ratio: ${heads/tails}\n");
44 Expect.approxEquals(1.0, heads/tails, 0.1); 44 Expect.approxEquals(1.0, heads / tails, 0.1);
45 45
46 // A sequence of newly allocated Random number generators should have fair 46 // A sequence of newly allocated Random number generators should have fair
47 // initial tosses. 47 // initial tosses.
48 heads = 0; 48 heads = 0;
49 tails = 0; 49 tails = 0;
50 for (var i = 0; i < 10000; i++) { 50 for (var i = 0; i < 10000; i++) {
51 rnd = new Random(); 51 rnd = new Random();
52 if (rnd.nextBool()) { 52 if (rnd.nextBool()) {
53 heads++; 53 heads++;
54 } else { 54 } else {
55 tails++; 55 tails++;
56 } 56 }
57 } 57 }
58 print("Heads: $heads\n" 58 print("Heads: $heads\n"
59 "Tails: $tails\n" 59 "Tails: $tails\n"
60 "Ratio: ${heads/tails}\n"); 60 "Ratio: ${heads/tails}\n");
61 Expect.approxEquals(1.0, heads/tails, 0.1); 61 Expect.approxEquals(1.0, heads / tails, 0.1);
62 } 62 }
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