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#include "fast.h"
#include "shuffle.h"
#include "mersenne.h"
#include <library/cpp/testing/unittest/registar.h>
#include <util/generic/ylimits.h>
Y_UNIT_TEST_SUITE(TRandUtilsTest) {
template <typename... A>
static void TestRange(A&&... args) {
TString s0, s1;
ShuffleRange(s1, args...);
s1 = "0";
ShuffleRange(s1, args...);
s1 = "01";
ShuffleRange(s1, args...);
s1 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
s0 = s1.copy();
ShuffleRange(s1, args...);
UNIT_ASSERT(s0 != s1); // if shuffle does work, chances it will fail are 1 to 64!.
}
template <typename... A>
static void TestIter(A&&... args) {
TString s0, s1;
auto f = [&]() {
auto b = s1.begin();
auto e = s1.end();
Shuffle(b, e, args...);
};
s1 = "0";
f();
s1 = "01";
f();
s1 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
s0 = s1.copy();
f();
UNIT_ASSERT(s0 != s1); // if shuffle does work, chances it will fail are 1 to 64!.
}
template <typename... A>
static void TestIterPartial(A&&... args) {
TString s0, s1;
auto f = [&](int shuffledSize) {
auto b = s1.begin();
auto e = s1.end();
PartialShuffle(b, e, shuffledSize, args...);
};
s1 = "";
f(0);
s1 = "01";
f(1);
s1 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,.;?!";
s0 = s1.copy();
f(2);
size_t matchesCount = 0;
for (size_t i = 0; i < s0.size(); ++i) {
matchesCount += (s0[i] == s1[i]);
}
UNIT_ASSERT(matchesCount >= s1.size() - 4); // partial shuffle doesn't make non-necessary swaps.
s1 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,.;?!";
s0 = s1.copy();
f(64);
UNIT_ASSERT(s0 != s1); // if partial shuffle does work, chances it will fail are 1 to 64!.
}
Y_UNIT_TEST(TestShuffle) {
TestRange();
TestIterPartial();
}
Y_UNIT_TEST(TestShuffleMersenne64) {
TMersenne<ui64> prng(42);
TestRange(prng);
TestIterPartial(prng);
}
Y_UNIT_TEST(TestShuffleMersenne32) {
TMersenne<ui32> prng(24);
TestIter(prng);
TestIterPartial(prng);
}
Y_UNIT_TEST(TestShuffleFast32) {
TFastRng32 prng(24, 0);
TestIter(prng);
TestIterPartial(prng);
}
Y_UNIT_TEST(TestShuffleFast64) {
TFastRng64 prng(24, 0, 25, 1);
TestIter(prng);
TestIterPartial(prng);
}
}
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