1 files changed, 52 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/testsuite/20_util/hash/chi2_q_numeric_pattern_set.cc b/gcc-4.9/libstdc++-v3/testsuite/20_util/hash/chi2_q_numeric_pattern_set.cc
new file mode 100644
index 000000000..1840641d0
--- /dev/null
+++ b/gcc-4.9/libstdc++-v3/testsuite/20_util/hash/chi2_q_numeric_pattern_set.cc
@@ -0,0 +1,52 @@
+// { dg-options "-std=gnu++0x" }
+// Use smaller statistics when running on simulators, so it takes less time.
+// For x86_64-linux-gnu SAMPLES=30000 fails, so increase slightly.
+// { dg-options "-std=gnu++0x -DSAMPLES=35000" { target simulator } }
+
+// Copyright (C) 2010-2014 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 of a set of strings that all have a similar pattern,
+// intended to mimic some sort of ID string.
+void
+test_numeric_pattern_set()
+{
+  bool test __attribute__((unused)) = true;
+  const unsigned long N = SAMPLES;
+  const unsigned long k = N/100;
+  std::vector<std::string> set;
+  for (unsigned long i = 0; i < N; ++i)
+    {
+      long i1 = i % 100000;
+      long i2 = i / 100000;
+      char buf[16];
+      std::sprintf(buf, "XX-%05lu-%05lu", i1, i2);
+      set.push_back(buf);
+    }
+
+  double chi2 = chi2_hash(set, k);
+  VERIFY( chi2 < k*1.1 );
+}
+
+int
+main()
+{
+  test_numeric_pattern_set();
+  return 0;
+}