add .invalid test

README.md

@@ -113,6 +113,7 @@ Zones will be automatically resigned on any record updates via dynamic DNS.
 - [RFC 2782](https://tools.ietf.org/html/rfc2782): Service location
 - [RFC 3596](https://tools.ietf.org/html/rfc3596): IPv6
 - [RFC 6891](https://tools.ietf.org/html/rfc6891): Extension Mechanisms for DNS
+- [RFC 6761](https://tools.ietf.org/html/rfc6761): Special-Use Domain Names (resolver)
 
 ### Update operations
 - [RFC 2136](https://tools.ietf.org/html/rfc2136): Dynamic Update

resolver/src/lookup_state.rs

@@ -834,4 +834,17 @@ mod tests {
                 .is_err()
         );
     }
+
+    #[test]
+    fn test_early_return_invalid() {
+        let cache = Arc::new(Mutex::new(DnsLru::new(0)));
+        let client = mock(vec![empty()]);
+        let mut client = CachingClient{lru: cache, client: client};
+        
+        assert!(
+            client.lookup(Query::query(Name::from_ascii("horrible.invalid.").unwrap(), RecordType::A))
+                .wait()
+                .is_err()
+        );
+    }
 }