diff --git a/tests/test_schema_converter.py b/tests/test_schema_converter.py
index fbba3c9..96adf34 100644
--- a/tests/test_schema_converter.py
+++ b/tests/test_schema_converter.py
@@ -204,6 +204,9 @@ class TestSchemaConverter(TestCase):
             model(friends=["John", "Jane", "John"]).friends, {"John", "Jane"}
         )
 
+        with self.assertRaises(ValueError):
+            model()
+
         with self.assertRaises(ValueError):
             model(friends=[])