| // Use smaller statistics when running on simulators, so it takes less time. |
| // For powerpc-eabi, SAMPLES=30000 fails. |
| // { dg-options "-DSAMPLES=35000" { target simulator } } |
| // { dg-do run { target c++11 } } |
| |
| // Copyright (C) 2010-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| // |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include "chi2_quality.h" |
| |
| // Tests chi^2 for a distribution of uniformly generated random strings. |
| void |
| test_uniform_random() |
| { |
| std::srand(137); |
| std::unordered_set<std::string> set; |
| std::string s; |
| const unsigned long N = SAMPLES; |
| const unsigned long k = N/100; |
| const unsigned int len = 25; |
| while (set.size() < N) |
| { |
| s.clear(); |
| for (unsigned int i = 0; i < len; ++i) |
| s.push_back(rand() % 128); |
| set.insert(s); |
| } |
| |
| double chi2 = chi2_hash(set, k); |
| VERIFY( chi2 < k*1.1 ); |
| } |
| |
| int |
| main() |
| { |
| test_uniform_random(); |
| return 0; |
| } |