# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1264381508 -3600
# Node ID ebeb06686099480468beefd4ace43d9fc3b92458
# Parent  5a7d45614f3e34e391e2d039737ae08a30c3acbf
Tests for module 'fabs'.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-24  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'fabs'.
+	* modules/fabs-tests: New file.
+	* tests/test-fabs.c: New file.
+
 	Tests for module 'exp'.
 	* modules/exp-tests: New file.
 	* tests/test-exp.c: New file.
diff --git a/modules/fabs-tests b/modules/fabs-tests
new file mode 100644
--- /dev/null
+++ b/modules/fabs-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-fabs.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-fabs
+check_PROGRAMS += test-fabs
+test_fabs_LDADD = $(LDADD) @FABS_LIBM@
diff --git a/tests/test-fabs.c b/tests/test-fabs.c
new file mode 100644
--- /dev/null
+++ b/tests/test-fabs.c
@@ -0,0 +1,45 @@
+/* Test of fabs() function.
+   Copyright (C) 2010 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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (fabs, double, (double));
+
+#include "macros.h"
+
+volatile double x;
+double y;
+
+int
+main ()
+{
+  /* A particular positive value.  */
+  x = 0.6;
+  y = fabs (x);
+  ASSERT (y == 0.6);
+
+  /* A particular negative value.  */
+  x = -0.6;
+  y = fabs (x);
+  ASSERT (y == 0.6);
+
+  return 0;
+}