diff --git a/packages/wyatt_form_bloc/test/form_operation_test.dart b/packages/wyatt_form_bloc/test/form_operation_test.dart
index 825374b1..f2af3712 100644
--- a/packages/wyatt_form_bloc/test/form_operation_test.dart
+++ b/packages/wyatt_form_bloc/test/form_operation_test.dart
@@ -59,6 +59,11 @@ void main() {
       final result = const FormReplace().call(formA, formB);
       expect(result, formB);
     });
+
+    test('returns A when called on (A,A)', () {
+      final result = const FormReplace().call(formA, formA);
+      expect(result, formA);
+    });
   });
 
   group('FormUnion', () {