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 class RandomNumberGeneratorTest : public ::testing::TestWithParam<int> {};
14
15
16 static const int kMaxRuns = 12345;
17
18
TEST_P(RandomNumberGeneratorTest,NextIntWithMaxValue)19 TEST_P(RandomNumberGeneratorTest, NextIntWithMaxValue) {
20 RandomNumberGenerator rng(GetParam());
21 for (int max = 1; max <= kMaxRuns; ++max) {
22 int n = rng.NextInt(max);
23 EXPECT_LE(0, n);
24 EXPECT_LT(n, max);
25 }
26 }
27
28
TEST_P(RandomNumberGeneratorTest,NextBooleanReturnsFalseOrTrue)29 TEST_P(RandomNumberGeneratorTest, NextBooleanReturnsFalseOrTrue) {
30 RandomNumberGenerator rng(GetParam());
31 for (int k = 0; k < kMaxRuns; ++k) {
32 bool b = rng.NextBool();
33 EXPECT_TRUE(b == false || b == true);
34 }
35 }
36
37
TEST_P(RandomNumberGeneratorTest,NextDoubleReturnsValueBetween0And1)38 TEST_P(RandomNumberGeneratorTest, NextDoubleReturnsValueBetween0And1) {
39 RandomNumberGenerator rng(GetParam());
40 for (int k = 0; k < kMaxRuns; ++k) {
41 double d = rng.NextDouble();
42 EXPECT_LE(0.0, d);
43 EXPECT_LT(d, 1.0);
44 }
45 }
46
47
48 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 } // namespace v8
54