intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 69 insertions, 0 deletions

diff --git a/util/random/common_ops_ut.cpp b/util/random/common_ops_ut.cpp
new file mode 100644
index 00000000000..905912bd1ed
--- /dev/null
+++ b/util/random/common_ops_ut.cpp
@@ -0,0 +1,69 @@
+#include "common_ops.h"
+#include "random.h"
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/digest/numeric.h>
+
+#include <random>
+
+Y_UNIT_TEST_SUITE(TestCommonRNG) {
+    template <class T>
+    struct TRng: public TCommonRNG<T, TRng<T>> {
+        inline T GenRand() noexcept {
+            return IntHash(C_++);
+        }
+
+        T C_ = RandomNumber<T>();
+    };
+
+    Y_UNIT_TEST(TestUniform1) {
+        TRng<ui32> r;
+
+        for (size_t i = 0; i < 1000; ++i) {
+            UNIT_ASSERT(r.Uniform(10) < 10);
+        }
+    }
+
+    Y_UNIT_TEST(TestUniform2) {
+        TRng<ui32> r;
+
+        for (size_t i = 0; i < 1000; ++i) {
+            UNIT_ASSERT(r.Uniform(1) == 0);
+        }
+    }
+
+    Y_UNIT_TEST(TestUniform3) {
+        TRng<ui32> r;
+
+        for (size_t i = 0; i < 1000; ++i) {
+            auto x = r.Uniform(100, 200);
+
+            UNIT_ASSERT(x >= 100);
+            UNIT_ASSERT(x < 200);
+        }
+    }
+
+    Y_UNIT_TEST(TestStlCompatibility) {
+        {
+            TRng<ui32> r;
+            r.C_ = 17;
+            std::normal_distribution<float> nd(0, 1);
+            UNIT_ASSERT_DOUBLES_EQUAL(nd(r), -0.877167, 0.01);
+        }
+
+        {
+            TRng<ui64> r;
+            r.C_ = 17;
+            std::normal_distribution<double> nd(0, 1);
+            UNIT_ASSERT_DOUBLES_EQUAL(nd(r), -0.5615566731, 0.01);
+        }
+
+        {
+            TRng<ui16> r;
+            r.C_ = 17;
+            std::normal_distribution<long double> nd(0, 1);
+            UNIT_ASSERT_DOUBLES_EQUAL(nd(r), -0.430375088, 0.01);
+        }
+    }
+}