diff --git a/test/core/discovery_test.dart b/test/core/discovery_test.dart
index 98286c5b..49d962e6 100644
--- a/test/core/discovery_test.dart
+++ b/test/core/discovery_test.dart
@@ -301,6 +301,21 @@ void main() {
       expect(thingDiscoveryProcess.done, true);
     });
 
+    test('should reject invalid TDD Thing Descriptions', () async {
+      final servient = Servient(
+        clientFactories: [
+          _MockedProtocolClientFactory(),
+        ],
+      );
+
+      final wot = await servient.start();
+
+      expect(
+        () async => await wot.exploreDirectory(validTestDiscoveryUri),
+        throwsA(isA<DiscoveryException>()),
+      );
+    });
+
     test('should be able to handle an array of invalid TDs during discovery',
         () async {
       final servient = Servient(