src/gromacs/random/tests/uniformintdistribution.cpp

   1 /*
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  35 /*! \internal \file
  36  * \brief Tests for GROMACS uniform integer distribution
  37  *
  38  * \author Erik Lindahl <erik.lindahl@gmail.com>
  39  * \ingroup module_random
  40  */
  41 #include "gmxpre.h"
  42
  43 #include "gromacs/random/uniformintdistribution.h"
  44
  45 #include <gtest/gtest.h>
  46
  47 #include "gromacs/random/threefry.h"
  48
  49 #include "testutils/refdata.h"
  50 #include "testutils/testasserts.h"
  51
  52 namespace gmx
  53 {
  54
  55 namespace
  56 {
  57
  58 TEST(UniformIntDistributionTest, Output)
  59 {
  60     gmx::test::TestReferenceData            data;
  61     gmx::test::TestReferenceChecker         checker(data.rootChecker());
  62
  63     gmx::ThreeFry2x64<8>                    rng(123456, gmx::RandomDomain::Other);
  64     gmx::UniformIntDistribution<int>        dist(1, 1000);
  65     std::vector<int>                        result;
  66
  67     for (int i = 0; i < 10; i++)
  68     {
  69         result.push_back(dist(rng));
  70     }
  71     checker.checkSequence(result.begin(), result.end(), "UniformIntDistribution");
  72 }
  73
  74
  75 TEST(UniformIntDistributionTest, Logical)
  76 {
  77     gmx::ThreeFry2x64<8>               rng(123456, gmx::RandomDomain::Other);
  78     gmx::UniformIntDistribution<int>   distA(2, 5);
  79     gmx::UniformIntDistribution<int>   distB(2, 5);
  80     gmx::UniformIntDistribution<int>   distC(3, 5);
  81     gmx::UniformIntDistribution<int>   distD(2, 4);
  82
  83     EXPECT_EQ(distA, distB);
  84     EXPECT_NE(distA, distC);
  85     EXPECT_NE(distA, distD);
  86 }
  87
  88
  89 TEST(UniformIntDistributionTest, Reset)
  90 {
  91     gmx::ThreeFry2x64<8>                         rng(123456, gmx::RandomDomain::Other);
  92     gmx::UniformIntDistribution<int>             distA(2, 5);
  93     gmx::UniformIntDistribution<int>             distB(2, 5);
  94     gmx::UniformIntDistribution<>::result_type   valA, valB;
  95
  96     valA = distA(rng);
  97
  98     distB(rng);
  99     rng.restart();
 100     distB.reset();
 101
 102     valB = distB(rng);
 103
 104     EXPECT_EQ(valA, valB);
 105 }
 106
 107 TEST(UniformIntDistributionTest, AltParam)
 108 {
 109     gmx::ThreeFry2x64<8>                          rngA(123456, gmx::RandomDomain::Other);
 110     gmx::ThreeFry2x64<8>                          rngB(123456, gmx::RandomDomain::Other);
 111     gmx::UniformIntDistribution<int>              distA(2, 5);
 112     gmx::UniformIntDistribution<int>              distB; // default parameters
 113     gmx::UniformIntDistribution<int>::param_type  paramA(2, 5);
 114
 115     EXPECT_NE(distA(rngA), distB(rngB));
 116     rngA.restart();
 117     rngB.restart();
 118     distA.reset();
 119     distB.reset();
 120     EXPECT_EQ(distA(rngA), distB(rngB, paramA));
 121 }
 122
 123
 124 }      // namespace anonymous
 125
 126 }      // namespace gmx