From b61b62a2fd3a660a0a22b083a2b90a8f0e738b27 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sat, 14 Jan 2012 15:22:49 +0100
Subject: [PATCH] Tests for module 'random'.

* modules/random-tests: New file.
* tests/test-random.c: New file, based on tests/test-random_r.c.
---
 ChangeLog            |  4 ++++
 modules/random-tests | 12 ++++++++++++
 tests/test-random.c  | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 modules/random-tests
 create mode 100644 tests/test-random.c

diff --git a/ChangeLog b/ChangeLog
index 8404e064e..74a90929e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-01-14  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'random'.
+	* modules/random-tests: New file.
+	* tests/test-random.c: New file, based on tests/test-random_r.c.
+
 	New module 'random'.
 	* lib/stdlib.in.h (random, srandom, initstate, setstate): New
 	declarations.
diff --git a/modules/random-tests b/modules/random-tests
new file mode 100644
index 000000000..27e5fb938
--- /dev/null
+++ b/modules/random-tests
@@ -0,0 +1,12 @@
+Files:
+tests/test-random.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-random
+check_PROGRAMS += test-random
diff --git a/tests/test-random.c b/tests/test-random.c
new file mode 100644
index 000000000..9a36d5667
--- /dev/null
+++ b/tests/test-random.c
@@ -0,0 +1,49 @@
+/* Test random.
+   Copyright (C) 2008-2012 Free Software Foundation, Inc.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (srandom, void, (unsigned int));
+SIGNATURE_CHECK (initstate, char *, (unsigned int, char *, size_t));
+SIGNATURE_CHECK (setstate, char *, (char *));
+SIGNATURE_CHECK (random, long, (void));
+
+#include <time.h>
+
+#include "macros.h"
+
+int
+main ()
+{
+  char buf[128];
+  unsigned int i;
+  unsigned int n_big = 0;
+
+  initstate (time (NULL), buf, sizeof buf);
+  for (i = 0; i < 1000; i++)
+    {
+      long r = random ();
+      ASSERT (0 <= r);
+      if (RAND_MAX / 2 < r)
+        ++n_big;
+    }
+
+  /* Fail if none of the numbers were larger than RAND_MAX / 2.  */
+  return !n_big;
+}
-- 
2.11.0