diff --git a/test/string_calculator_test.dart b/test/string_calculator_test.dart
index dc7ddfa..65ca2d9 100644
--- a/test/string_calculator_test.dart
+++ b/test/string_calculator_test.dart
@@ -32,5 +32,10 @@ void main() {
       expect(calculator.add('//;\n1;2'), equals(3));
       expect(calculator.add('//|\n10|20|30'), equals(60));
     });
+
+    test('numbers greater than 1000 are ignored', () {
+      expect(calculator.add('2,1001'), equals(2));
+      expect(calculator.add('1000,1001,2'), equals(1002));
+    });
   });
 }