| // Copyright (c) 2012, 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. |
| |
| // @dart = 2.9 |
| |
| library test_sample_extension; |
| |
| import 'sample_asynchronous_extension.dart'; |
| |
| void check(bool condition, String message) { |
| if (!condition) { |
| throw new StateError(message); |
| } |
| } |
| |
| void main() { |
| RandomArray r = new RandomArray(); |
| r.randomArray(17, 100).then((list_100) { |
| r.randomArray(17, 200).then((list_200) { |
| for (var i = 0; i < 100; ++i) { |
| check(list_100[i] == list_200[i], "list_100[i] == list_200[i]"); |
| } |
| }); |
| }); |
| |
| // Gets a list of 256000 random uint8 values, using seed 19, and |
| // runs checkNormal on that list. |
| r.randomArray(19, 256000).then(checkNormal); |
| } |
| |
| void checkNormal(List l) { |
| // Count how many times each byte value occurs. Assert that the counts |
| // are all within a reasonable (six-sigma) range. |
| List counts = new List<int>.filled(256, 0); |
| for (var e in l) { |
| counts[e]++; |
| } |
| new RandomArray().randomArray(18, 256000).then(checkCorrelation(counts)); |
| } |
| |
| Function checkCorrelation(List counts) { |
| return (List l) { |
| List counts_2 = new List<int>.filled(256, 0); |
| for (var e in l) { |
| counts_2[e]++; |
| } |
| var product = 0; |
| for (var i = 0; i < 256; ++i) { |
| check(counts[i] < 1200, "counts[i] < 1200"); |
| check(counts_2[i] < 1200, "counts_2[i] < 1200"); |
| check(counts[i] > 800, "counts[i] > 800"); |
| check(counts[i] > 800, "counts[i] > 800"); |
| |
| product += counts[i] * counts_2[i]; |
| } |
| check(product < 256000000 * 1.001, "product < 256000000 * 1.001"); |
| check(product > 256000000 * 0.999, "product > 256000000 * 0.999"); |
| }; |
| } |