Bob Nystrom
6c757957db
DDC's codegen test copies those files to a local "gen" directory so that it can do stuff like splitting out the multitests before it compiles them to JS. I left all of that alone, so the rest of DDC's test infrastructure is unchanged. The very first step that builds the "gen" directory just copies from sdk/tests/..._strong/... instead and the rest is good to go. I did not move not_yet_strong_tests.dart somewhere more accessible yet because I'm not sure if kernel needs it or where it should go. I did not create any status files because DDC doesn't need them and there are no test suites for the new directories for the other platforms.
102 lines
4.4 KiB
Dart
102 lines
4.4 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Test that rnd.nextInt with a seed generates the same sequence each time.
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// Library tag to allow Dartium to run the test.
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library random_test;
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import "package:expect/expect.dart";
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import 'dart:math';
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main() {
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checkSequence();
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checkSeed();
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}
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void checkSequence() {
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// Check the sequence of numbers generated by the random generator for a seed
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// doesn't change unintendedly, and it agrees between implementations.
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var rnd = new Random(20130307);
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// Make sure we do not break the random number generation.
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// If the random algorithm changes, make sure both the VM and dart2js
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// generate the same new sequence.
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var i = 1;
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Expect.equals( 0, rnd.nextInt(i *= 2));
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Expect.equals( 3, rnd.nextInt(i *= 2));
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Expect.equals( 7, rnd.nextInt(i *= 2));
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Expect.equals( 5, rnd.nextInt(i *= 2));
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Expect.equals( 29, rnd.nextInt(i *= 2));
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Expect.equals( 17, rnd.nextInt(i *= 2));
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Expect.equals( 104, rnd.nextInt(i *= 2));
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Expect.equals( 199, rnd.nextInt(i *= 2));
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Expect.equals( 408, rnd.nextInt(i *= 2));
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Expect.equals( 362, rnd.nextInt(i *= 2));
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Expect.equals( 995, rnd.nextInt(i *= 2));
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Expect.equals( 2561, rnd.nextInt(i *= 2));
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Expect.equals( 2548, rnd.nextInt(i *= 2));
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Expect.equals( 9553, rnd.nextInt(i *= 2));
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Expect.equals( 2628, rnd.nextInt(i *= 2));
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Expect.equals( 42376, rnd.nextInt(i *= 2));
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Expect.equals( 101848, rnd.nextInt(i *= 2));
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Expect.equals( 85153, rnd.nextInt(i *= 2));
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Expect.equals( 495595, rnd.nextInt(i *= 2));
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Expect.equals( 647122, rnd.nextInt(i *= 2));
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Expect.equals( 793546, rnd.nextInt(i *= 2));
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Expect.equals( 1073343, rnd.nextInt(i *= 2));
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Expect.equals( 4479969, rnd.nextInt(i *= 2));
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Expect.equals( 9680425, rnd.nextInt(i *= 2));
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Expect.equals( 28460171, rnd.nextInt(i *= 2));
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Expect.equals( 49481738, rnd.nextInt(i *= 2));
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Expect.equals( 9878974, rnd.nextInt(i *= 2));
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Expect.equals( 132552472, rnd.nextInt(i *= 2));
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Expect.equals( 210267283, rnd.nextInt(i *= 2));
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Expect.equals( 125422442, rnd.nextInt(i *= 2));
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Expect.equals( 226275094, rnd.nextInt(i *= 2));
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Expect.equals(1639629168, rnd.nextInt(i *= 2));
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Expect.equals(0x100000000, i);
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// If max is too large expect an ArgumentError.
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Expect.throws(() => rnd.nextInt(i + 1), (e) => e is ArgumentError);
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rnd = new Random(6790);
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Expect.approxEquals(0.1202733131, rnd.nextDouble());
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Expect.approxEquals(0.5554054805, rnd.nextDouble());
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Expect.approxEquals(0.0385160727, rnd.nextDouble());
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Expect.approxEquals(0.2836345217, rnd.nextDouble());
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}
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void checkSeed() {
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// Check that various seeds generate the expected first values.
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// 53 significant bits, so the number is representable in JS.
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var rawSeed = 0x19a32c640e1d71;
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var expectations = [
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26007, 43006, 46458, 18610, 16413, 50455, 2164, 47399, 8859, 9732,
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20367, 33935, 54549, 54913, 4819, 24198, 49353, 22277, 51852, 35959,
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45347, 12100, 10136, 22372, 15293, 20066, 1351, 49030, 64845, 12793,
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50916, 55784, 43170, 27653, 34696, 1492, 50255, 9597, 45929, 2874,
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27629, 53084, 36064, 42140, 32016, 41751, 13967, 20516, 578, 16773,
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53064, 14814, 22737, 48846, 45147, 10205, 56584, 63711, 44128, 21099,
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47966, 35471, 39576, 1141, 45716, 54940, 57406, 15437, 31721, 35044,
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28136, 39797, 50801, 22184, 58686
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];
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var negative_seed_expectations = [
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12170, 42844, 39228, 64032, 29046, 57572, 8453, 52224, 27060, 28454,
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20510, 28804, 59221, 53422, 11047, 50864, 33997, 19611, 1250, 65088,
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19690, 11396, 20, 48867, 44862, 47129, 58724, 13325, 50005, 33320,
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16523, 4740, 63721, 63272, 30545, 51403, 35845, 3943, 31850, 23148,
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26307, 1724, 29281, 39988, 43653, 48012, 43810, 16755, 13105, 25325,
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32648, 19958, 38838, 8322, 3421, 28624, 17269, 45385, 50680, 1696,
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26088, 2787, 48566, 34357, 27731, 51764, 8455, 16498, 59721, 59568,
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46333, 7935, 51459, 36766, 50711
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];
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for (var i = 0, m = 1; i < 75; i++) {
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Expect.equals(expectations[i], new Random(rawSeed * m).nextInt(65536));
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Expect.equals(negative_seed_expectations[i],
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new Random(rawSeed * -m).nextInt(65536));
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m *= 2;
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}
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// And test zero seed too.
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Expect.equals(21391, new Random(0).nextInt(65536));
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}
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