Test TLD validation

diff --git a/src/test/test_util.c b/src/test/test_util.c
index 2fa03e5bc76be9b2e22506adf89cc0a6b5795e88..db2ea1a348b25616ef10f68fbd489f6256440328 100644 (file)
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -5589,6 +5589,12 @@ test_util_hostname_validation(void *arg)
   tt_assert(!string_is_valid_hostname("[2a00:1450:401b:800::200e]"));
   tt_assert(!string_is_valid_hostname("2a00:1450:401b:800::200e"));
 
+  // Last label of a hostname is required to be alphabetic according to
+  // RFC 1123 Section 2.1.
+  tt_assert(!string_is_valid_hostname("lucky.13"));
+  tt_assert(!string_is_valid_hostname("luck.y13"));
+  tt_assert(!string_is_valid_hostname("luck.y13."));
+
   done:
   return;
 }