X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/5089a0a98b27f5eeee62321dff4f025f1648f025..f6de62b5c3b55d3c2ce894afafaff73248347c62:/src/xbt/random_test.cpp

diff --git a/src/xbt/random_test.cpp b/src/xbt/random_test.cpp
index c93049b8b0..a474825426 100644
--- a/src/xbt/random_test.cpp
+++ b/src/xbt/random_test.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2019. The SimGrid Team. All rights reserved.               */
+/* Copyright (c) 2019-2021. The SimGrid Team. All rights reserved.               */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -6,16 +6,70 @@
 #include "src/include/catch.hpp"
 #include "xbt/log.h"
 #include "xbt/random.hpp"
+#include <random>
+#include <cmath>
+
+#define EpsilonApprox(a) Catch::Matchers::WithinAbs((a), 100 * std::numeric_limits<double>::epsilon())
 
 TEST_CASE("xbt::random: Random Number Generation")
 {
-  SECTION("Random")
+  SECTION("Using XBT_RNG_xbt")
   {
+    simgrid::xbt::random::set_implem_xbt();
     simgrid::xbt::random::set_mersenne_seed(12345);
-
-    REQUIRE(simgrid::xbt::random::exponential(25) == 0.00291934351538427348);
+    REQUIRE_THAT(simgrid::xbt::random::exponential(25), EpsilonApprox(0.00291934351538427348));
     REQUIRE(simgrid::xbt::random::uniform_int(1, 6) == 4);
-    REQUIRE(simgrid::xbt::random::uniform_real(0, 1) == 0.31637556043369124970);
-    REQUIRE(simgrid::xbt::random::normal(0, 2) == 1.62746784745133976635);
+    REQUIRE_THAT(simgrid::xbt::random::uniform_real(0, 1), EpsilonApprox(0.31637556043369124970));
+    REQUIRE_THAT(simgrid::xbt::random::normal(0, 2), EpsilonApprox(1.62746784745133976635));
+
+    constexpr int imin = std::numeric_limits<int>::min();
+    constexpr int imax = std::numeric_limits<int>::max();
+    REQUIRE(simgrid::xbt::random::uniform_int(0, 0) == 0);
+    REQUIRE(simgrid::xbt::random::uniform_int(imin, imin) == imin);
+    REQUIRE(simgrid::xbt::random::uniform_int(imax, imax) == imax);
+
+    REQUIRE(simgrid::xbt::random::uniform_int(-6, -1) == -3);
+    REQUIRE(simgrid::xbt::random::uniform_int(-10, 10) == 7);
+    REQUIRE(simgrid::xbt::random::uniform_int(imin, 2) == -163525263);
+    REQUIRE(simgrid::xbt::random::uniform_int(-2, imax) == 1605979225);
+    REQUIRE(simgrid::xbt::random::uniform_int(imin, imax) == 659577591);
+  }
+
+  SECTION("Using XBT_RNG_std")
+  {
+    std::mt19937 gen;
+    gen.seed(12345);
+
+    simgrid::xbt::random::set_implem_std();
+    simgrid::xbt::random::set_mersenne_seed(12345);
+
+    std::exponential_distribution<> distA(25);
+    std::uniform_int_distribution<> distB(1, 6);
+    std::uniform_real_distribution<> distC(0, 1);
+    std::normal_distribution<> distD(0, 2);
+
+    REQUIRE_THAT(simgrid::xbt::random::exponential(25), EpsilonApprox(distA(gen)));
+    REQUIRE(simgrid::xbt::random::uniform_int(1, 6) == distB(gen));
+    REQUIRE_THAT(simgrid::xbt::random::uniform_real(0, 1), EpsilonApprox(distC(gen)));
+    REQUIRE_THAT(simgrid::xbt::random::normal(0, 2), EpsilonApprox(distD(gen)));
+  }
+
+  SECTION("XBT_RNG_std write to a file")
+  {
+    simgrid::xbt::random::set_implem_std();
+    simgrid::xbt::random::set_mersenne_seed(12345);
+
+    simgrid::xbt::random::exponential(25);
+    bool writtenA = simgrid::xbt::random::write_mersenne_state("rdm_state_tmp.txt");
+    double resB = simgrid::xbt::random::uniform_real(10, 20);
+    double resC = simgrid::xbt::random::normal(0, 2);
+    bool writtenB = simgrid::xbt::random::read_mersenne_state("rdm_state_tmp.txt");
+    REQUIRE(writtenA);
+    REQUIRE(writtenB);
+    REQUIRE_THAT(simgrid::xbt::random::uniform_real(10, 20), EpsilonApprox(resB));
+    REQUIRE_THAT(simgrid::xbt::random::normal(0, 2), EpsilonApprox(resC));
+    if (writtenB) {
+      std::remove("rdm_state_tmp.txt");
+    }
   }
 }