1// Copyright 2017 PDFium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "core/fxcrt/fx_random.h"
6
7#include <array>
8#include <set>
9
10#include "testing/gtest/include/gtest/gtest.h"
11
12TEST(FX_Random, GenerateMT3600times) {
13  // Prove this doesn't spin wait for a second each time.
14  // Since our global seeds are sequential, they wont't collide once
15  // seeded until 2^32 calls, and if the PNRG is any good, we won't
16  // get the same sequence from different seeds, esp. with this few
17  // iterations.
18  std::set<std::array<uint32_t, 16>> seen;
19  std::array<uint32_t, 16> current;
20  for (int i = 0; i < 3600; ++i) {
21    FX_Random_GenerateMT(current.data(), 16);
22    EXPECT_TRUE(seen.insert(current).second);
23  }
24}
25