diff --git a/src/resolve/test-dns-synthesize.c b/src/resolve/test-dns-synthesize.c
index 5b89e962d2..64523f4854 100644
--- a/src/resolve/test-dns-synthesize.c
+++ b/src/resolve/test-dns-synthesize.c
@@ -8,6 +8,26 @@
 #include "resolved-manager.h"
 #include "tests.h"
 
+/* ================================================================
+ * dns_synthesize_family(), dns_synthesize_protocol()
+ * ================================================================ */
+
+TEST(dns_synthesize_family_and_protocol) {
+        int flags;
+
+        flags = SD_RESOLVED_FLAGS_MAKE(DNS_PROTOCOL_DNS, AF_INET, false, false);
+        ASSERT_EQ(dns_synthesize_family(flags), AF_UNSPEC);
+        ASSERT_EQ(dns_synthesize_protocol(flags), DNS_PROTOCOL_DNS);
+
+        flags = SD_RESOLVED_FLAGS_MAKE(DNS_PROTOCOL_LLMNR, AF_INET6, false, false);
+        ASSERT_EQ(dns_synthesize_family(flags), AF_INET6);
+        ASSERT_EQ(dns_synthesize_protocol(flags), DNS_PROTOCOL_LLMNR);
+
+        flags = SD_RESOLVED_FLAGS_MAKE(DNS_PROTOCOL_MDNS, AF_INET, false, false);
+        ASSERT_EQ(dns_synthesize_family(flags), AF_INET);
+        ASSERT_EQ(dns_synthesize_protocol(flags), DNS_PROTOCOL_MDNS);
+}
+
 /* ================================================================
  * dns_synthesize_answer()
  * ================================================================ */