diff --git a/test/vector/constructors/from_list_constructor/vector_from_list_constructor_test_group_factory.dart b/test/vector/constructors/from_list_constructor/vector_from_list_constructor_test_group_factory.dart
index f42df26b..ad259200 100644
--- a/test/vector/constructors/from_list_constructor/vector_from_list_constructor_test_group_factory.dart
+++ b/test/vector/constructors/from_list_constructor/vector_from_list_constructor_test_group_factory.dart
@@ -56,5 +56,25 @@ void vectorFromListConstructorTestGroupFactory(DType dtype) =>
           expect(vector.length, 0);
           expect(vector.dtype, dtype);
         });
+
+        test('should provide correct size of vectors when summing up, length is 3', () {
+          final vector1 = Vector.fromList([1, 2, 3], dtype: dtype);
+          final vector2 = Vector.fromList([3, 4, 5], dtype: dtype);
+          final vector = vector1 + vector2;
+
+          expect(vector, equals(<double>[4, 6, 8]));
+          expect(vector.length, 3);
+          expect(vector.dtype, dtype);
+        });
+
+        test('should provide correct size of vectors when summing up, length is 5', () {
+          final vector1 = Vector.fromList([1, 2, 3, 4, 5], dtype: dtype);
+          final vector2 = Vector.fromList([3, 4, 5, 6, 7], dtype: dtype);
+          final vector = vector1 + vector2;
+
+          expect(vector, equals(<double>[4, 6, 8, 10, 12]));
+          expect(vector.length, 5);
+          expect(vector.dtype, dtype);
+        });
       });
     });