1 files changed, 43 insertions, 0 deletions
diff --git a/tests/test-getentropy.c b/tests/test-getentropy.c
new file mode 100644
index 0000000000..845c5dcaf0
--- /dev/null
+++ b/tests/test-getentropy.c
@@ -0,0 +1,43 @@
+/* Test the getentropy function.
+   Copyright 2020 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 <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <string.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getentropy, int, (void *, size_t));
+
+#include "macros.h"
+
+char empty_buf[256];
+char buf[256];
+
+int
+main (int argc, char *argv[])
+{
+  /* If this test fails, there's something wrong with the setup anyway.  */
+  ASSERT (getentropy (buf, sizeof buf) == 0);
+
+  /* This test fails with probability 2**-2048.  (Run it again if so. :-) */
+  ASSERT (memcmp (buf, empty_buf, sizeof buf) != 0);
+
+  return 0;
+}