From 253a2c09b53c1a6f1a74683475cbde91cf7e95f4 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Mon, 25 Jan 2010 02:13:03 +0100
Subject: [PATCH] Tests for module 'nextafter'.

---
 ChangeLog               |  4 ++++
 modules/nextafter-tests | 13 ++++++++++++
 tests/test-nextafter.c  | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+)
 create mode 100644 modules/nextafter-tests
 create mode 100644 tests/test-nextafter.c

diff --git a/ChangeLog b/ChangeLog
index e62408c2d..8da026c91 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-24  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'nextafter'.
+	* modules/nextafter-tests: New file.
+	* tests/test-nextafter.c: New file.
+
 	Tests for module 'modf'.
 	* modules/modf-tests: New file.
 	* tests/test-modf.c: New file.
diff --git a/modules/nextafter-tests b/modules/nextafter-tests
new file mode 100644
index 000000000..1bb372a1f
--- /dev/null
+++ b/modules/nextafter-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-nextafter.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-nextafter
+check_PROGRAMS += test-nextafter
+test_nextafter_LDADD = $(LDADD) @NEXTAFTER_LIBM@
diff --git a/tests/test-nextafter.c b/tests/test-nextafter.c
new file mode 100644
index 000000000..bc1d40f81
--- /dev/null
+++ b/tests/test-nextafter.c
@@ -0,0 +1,53 @@
+/* Test of nextafter() 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 (nextafter, double, (double, double));
+
+#include "macros.h"
+
+volatile double x;
+double y;
+
+int
+main ()
+{
+  /* A particular value.  */
+  x = 1.628947572;
+  /* Towards 0.  */
+  y = nextafter (x, 0);
+  ASSERT (y < x);
+  ASSERT (y > 1.628947571);
+  y = nextafter (y, x + x);
+  ASSERT (y == x);
+  /* Towards infinity.  */
+  y = nextafter (x, x + x);
+  ASSERT (y > x);
+  ASSERT (y < 1.628947573);
+  y = nextafter (y, 0);
+  ASSERT (y == x);
+  /* Towards itself.  */
+  y = nextafter (x, x);
+  ASSERT (y == x);
+
+  return 0;
+}
-- 
2.11.0