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diff --git a/tests/test-binary-io.c b/tests/test-binary-io.c
new file mode 100644
index 000000000..3f5e9ccbf
--- /dev/null
+++ b/tests/test-binary-io.c
@@ -0,0 +1,66 @@
+/* Test of binary mode I/O.
+   Copyright (C) 2005, 2007 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 2, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "binary-io.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define ASSERT(expr) if (!(expr)) abort ();
+
+int
+main ()
+{
+  /* Test the O_BINARY macro.  */
+  {
+    int fd = open ("output2.tmp", O_CREAT | O_TRUNC | O_RDWR | O_BINARY);
+    if (write (fd, "Hello\n", 6) < 0)
+      exit (1);
+    close (fd);
+  }
+  {
+    struct stat statbuf;
+    if (stat ("output2.tmp", &statbuf) < 0)
+      exit (1);
+    ASSERT (statbuf.st_size == 6);
+  }
+  unlink ("output2.tmp");
+
+  /* Test the SET_BINARY macro.  */
+  SET_BINARY (1);
+  fputs ("Hello\n", stdout);
+  fclose (stdout);
+  fclose (stderr);
+  {
+    struct stat statbuf;
+    if (stat ("output.tmp", &statbuf) < 0)
+      exit (1);
+    ASSERT (statbuf.st_size == 6);
+  }
+
+  return 0;
+}