diff --git a/ap/libc/glibc/glibc-2.23/assert/test-assert.c b/ap/libc/glibc/glibc-2.23/assert/test-assert.c
new file mode 100644
index 0000000..26b58d4
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/assert/test-assert.c
@@ -0,0 +1,88 @@
+/* Test assert().
+ *
+ * This is hairier than you'd think, involving games with
+ * stdio and signals.
+ *
+ */
+
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <setjmp.h>
+
+jmp_buf rec;
+char buf[160];
+
+static void
+sigabrt (int unused)
+{
+  longjmp (rec, 1);  /* recover control */
+}
+
+#undef NDEBUG
+#include <assert.h>
+static void
+assert1 (void)
+{
+  assert (1 == 2);
+}
+
+static void
+assert2 (void)
+{
+  assert (1 == 1);
+}
+
+
+#define NDEBUG
+#include <assert.h>
+static void
+assert3 (void)
+{
+  assert (2 == 3);
+}
+
+int
+main (void)
+{
+
+  volatile int failed = 1;
+
+  fclose (stderr);
+  stderr = tmpfile ();
+  if(!stderr)
+    abort ();
+
+  signal (SIGABRT, sigabrt);
+
+  if (!setjmp (rec))
+    assert1 ();
+  else
+    failed = 0;  /* should happen */
+
+  if (!setjmp (rec))
+    assert2 ();
+  else
+    failed = 1; /* should not happen */
+
+  if (!setjmp (rec))
+    assert3 ();
+  else
+    failed = 1; /* should not happen */
+
+  rewind (stderr);
+  fgets (buf, 160, stderr);
+  if (!strstr (buf, "1 == 2"))
+    failed = 1;
+
+  fgets (buf, 160, stderr);
+  if (strstr (buf, "1 == 1"))
+    failed = 1;
+
+  fgets (buf, 160, stderr);
+  if (strstr (buf, "2 == 3"))
+    failed = 1;
+
+  return failed;
+}