Prolem with std::random_device and generation of section names

[osadowskyphd]

Description

I have a test that includes many randomized inputs. I wanted to trace them by including the randomization seed in a section name. The result is that the generated name completely misbehave if I use std::random_device to generate seeds, etc., while if I use pseudo-random generator things seem OK.

Steps to reproduce

TEST_CASE("Test random section name")
{
//std::random_device randomSource;
std::mt19937 randomSource(100);
std::uniform_int_distribution<size_t> generator;
std::vector<size_t> numbers;
for (size_t i = 0; i < 5; i++)
{
numbers.push_back(generator(randomSource));
}
for (size_t i = 0; i < 5; i++)
{
size_t number = numbers[i];
SECTION("Testing random number " + std::to_string(number))
{
std::cout << "Testing " << number << std::endl;
SUCCEED("Succeessful");
}
}
}
``

As written, this test succeeds with 5 pseudo-random numbers. However, replacing randomSource with a std::random_device makes an infinite loop.

There were multiple other issues when I used std::random_device, but this is the easiest to explain and the immediate need I have.

Extra information

• Catch version: 2.2.3
• Operating System: [from uname -a] Linux ubuntu 4.15.0-29-generic calls to toString should be qualified with Catch:: #31~16.04.1-Ubuntu SMP Wed Jul 18 08:54:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• Compiler+version: gcc-4.9.4