Line data    Source code

       1             : // Copyright 2014 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include <climits>
       6             : 
       7             : #include "src/base/utils/random-number-generator.h"
       8             : #include "testing/gtest/include/gtest/gtest.h"
       9             : 
      10             : namespace v8 {
      11             : namespace base {
      12             : 
      13          54 : class RandomNumberGeneratorTest : public ::testing::TestWithParam<int> {};
      14             : 
      15             : 
      16             : static const int kMaxRuns = 12345;
      17             : 
      18             : 
      19       15822 : TEST_P(RandomNumberGeneratorTest, NextIntWithMaxValue) {
      20           9 :   RandomNumberGenerator rng(GetParam());
      21      111114 :   for (int max = 1; max <= kMaxRuns; ++max) {
      22      111105 :     int n = rng.NextInt(max);
      23      111105 :     EXPECT_LE(0, n);
      24      111105 :     EXPECT_LT(n, max);
      25             :   }
      26           9 : }
      27             : 
      28             : 
      29       15822 : TEST_P(RandomNumberGeneratorTest, NextBooleanReturnsFalseOrTrue) {
      30           9 :   RandomNumberGenerator rng(GetParam());
      31      111114 :   for (int k = 0; k < kMaxRuns; ++k) {
      32             :     bool b = rng.NextBool();
      33             :     EXPECT_TRUE(b == false || b == true);
      34             :   }
      35           9 : }
      36             : 
      37             : 
      38       15822 : TEST_P(RandomNumberGeneratorTest, NextDoubleReturnsValueBetween0And1) {
      39           9 :   RandomNumberGenerator rng(GetParam());
      40      111114 :   for (int k = 0; k < kMaxRuns; ++k) {
      41      111105 :     double d = rng.NextDouble();
      42      111105 :     EXPECT_LE(0.0, d);
      43      111105 :     EXPECT_LT(d, 1.0);
      44             :   }
      45           9 : }
      46             : 
      47             : 
      48       99978 : INSTANTIATE_TEST_CASE_P(RandomSeeds, RandomNumberGeneratorTest,
      49             :                         ::testing::Values(INT_MIN, -1, 0, 1, 42, 100,
      50             :                                           1234567890, 987654321, INT_MAX));
      51             : 
      52             : }  // namespace base
      53        7893 : }  // namespace v8