test-fsync: enhance tests

[gnulib.git] / tests / test-fsync.c

diff --git a/tests/test-fsync.c b/tests/test-fsync.c
index 2627d0c..11c0478 100644 (file)
--- a/tests/test-fsync.c
+++ b/tests/test-fsync.c
@@ -32,13 +32,16 @@ main (void)
   int fd;
   const char *file = "test-fsync.txt";
 
-  if (fsync (0) != 0)
+  if (fsync (STDOUT_FILENO) != 0)
     {
       ASSERT (errno == EINVAL /* POSIX */
               || errno == ENOTSUP /* seen on MacOS X 10.5 */
               || errno == EBADF /* seen on AIX 7.1 */
-             );
+              );
     }
+  errno = 0;
+  ASSERT (fsync (-1) == -1);
+  ASSERT (errno == EBADF);
   fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
   ASSERT (0 <= fd);
   ASSERT (write (fd, "hello", 5) == 5);