Ichthyostega
ce2116fccd
* add new option to the commandline option parser * pass this as std::optional to the test-suite constructor * use this value optionally to inject a fixed value on re-seeding * provide diagnostic output to show the actual seed value used
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
/*
|
|
Random(Test) - verify framework for controlled random number generation
|
|
|
|
Copyright (C) Lumiera.org
|
|
2024, Hermann Vosseler <Ichthyostega@web.de>
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 2 of
|
|
the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
* *****************************************************/
|
|
|
|
/** @file random-test.cpp
|
|
** unit test \ref Random_test
|
|
*/
|
|
|
|
|
|
|
|
#include "lib/test/run.hpp"
|
|
#include "lib/random.hpp"
|
|
|
|
|
|
namespace lib {
|
|
namespace test {
|
|
|
|
/******************************************************************//**
|
|
* @test demonstrate simple access to random number generation,
|
|
* as well as the setup of controlled random number sequences.
|
|
* @see random.hpp
|
|
*/
|
|
class Random_test : public Test
|
|
{
|
|
|
|
virtual void
|
|
run (Arg)
|
|
{
|
|
simpleUsage();
|
|
verify_reproducibleSequence();
|
|
}
|
|
|
|
|
|
/** @test demonstrate usage of default random number generators.
|
|
* @note should [draw a seed](\ref Test::seedRand()) once per Test instance
|
|
*/
|
|
void
|
|
simpleUsage()
|
|
{
|
|
seedRand();
|
|
|
|
int r1 = rani();
|
|
CHECK (0 <= r1 and r1 < RAND_MAX);
|
|
|
|
int r2 = rani();
|
|
CHECK (0 <= r2 and r2 < RAND_MAX);
|
|
CHECK (r1 != r2);
|
|
}
|
|
|
|
|
|
/** @test demonstrate that random number sequences can be reproduced
|
|
* - use a rigged SeedNucleus, always returning a fixed sees
|
|
* - build two distinct random sequence generators, yet seeded
|
|
* from the same source; they will produce the same sequence
|
|
* - sequences can be re-shuffled by a seed value, so that
|
|
* the following random numbers will start to differ
|
|
* - but even this re-shuffling is deterministic
|
|
*/
|
|
void
|
|
verify_reproducibleSequence()
|
|
{
|
|
class : public SeedNucleus
|
|
{
|
|
uint64_t getSeed() override { return 55; }
|
|
}
|
|
coreOfEvil;
|
|
|
|
Random src1{coreOfEvil};
|
|
|
|
int r1 = src1.i32();
|
|
uint64_t r2 = src1.u64();
|
|
double r3 = src1.uni();
|
|
|
|
Random src2{coreOfEvil};
|
|
CHECK (r1 == src2.i32());
|
|
CHECK (r2 == src2.u64());
|
|
CHECK (r3 == src2.uni());
|
|
|
|
src1.reseed (coreOfEvil);
|
|
CHECK (src1.u64() != src2.u64());
|
|
|
|
src2.reseed (coreOfEvil);
|
|
CHECK (src1.u64() != src2.u64());
|
|
(void) src2.u64();
|
|
CHECK (src1.u64() == src2.u64());
|
|
CHECK (src1.i32() == src2.i32());
|
|
CHECK (src1.uni() == src2.uni());
|
|
}
|
|
};
|
|
|
|
LAUNCHER (Random_test, "unit common");
|
|
|
|
|
|
}} // namespace lib::test
|