commit 60149b28590be28051f99d0a343d7fbe002f2a8c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 21 13:09:08 2017 +0200

    __inet_pton_length: Implement new internal helper function

diff --git a/resolv/Makefile b/resolv/Makefile
index 3854ff4ad4156c15..692b2322cf7a3cab 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -65,6 +65,9 @@ tests += \
 
 endif
 
+# This test accesses __inet_ntop_range, an internal libc function.
+tests += tst-inet_pton
+
 # This test sends millions of packets and is rather slow.
 xtests += tst-resolv-qtypes
 endif