1// { dg-options "-std=gnu++11" }
2// Use smaller statistics when running on simulators, so it takes less time.
3// For x86_64-linux-gnu SAMPLES=30000 fails, so increase slightly.
4// { dg-options "-std=gnu++11 -DSAMPLES=35000" { target simulator } }
5
6// Copyright (C) 2010-2015 Free Software Foundation, Inc.
7//
8// This file is part of the GNU ISO C++ Library.  This library is free
9// software; you can redistribute it and/or modify it under the
10// terms of the GNU General Public License as published by the
11// Free Software Foundation; either version 3, or (at your option)
12// any later version.
13//
14// This library is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17// GNU General Public License for more details.
18//
19// You should have received a copy of the GNU General Public License
20// along with this library; see the file COPYING3.  If not see
21// <http://www.gnu.org/licenses/>.
22
23#include "chi2_quality.h"
24
25// Tests chi^2 of a set of strings that all have a similar pattern,
26// intended to mimic some sort of ID string.
27void
28test_numeric_pattern_set()
29{
30  bool test __attribute__((unused)) = true;
31  const unsigned long N = SAMPLES;
32  const unsigned long k = N/100;
33  std::vector<std::string> set;
34  for (unsigned long i = 0; i < N; ++i)
35    {
36      long i1 = i % 100000;
37      long i2 = i / 100000;
38      char buf[16];
39      std::sprintf(buf, "XX-%05lu-%05lu", i1, i2);
40      set.push_back(buf);
41    }
42
43  double chi2 = chi2_hash(set, k);
44  VERIFY( chi2 < k*1.1 );
45}
46
47int
48main()
49{
50  test_numeric_pattern_set();
51  return 0;
52}
53