1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/test/test_opcodes.py b/Lib/test/test_opcodes.py
index 8fe77ac6b7..4403a114d2 100644
--- a/Lib/test/test_opcodes.py
+++ b/Lib/test/test_opcodes.py
@@ -98,6 +98,12 @@ class OpcodeTest(unittest.TestCase):
         g = eval('lambda a=1: None')
         self.assertNotEquals(f, g)
 
+    def test_modulo_of_string_subclasses(self):
+        class MyString(str):
+            def __mod__(self, value):
+                return 42
+        self.assertEqual(MyString() % 3, 42)
+
 
 def test_main():
     run_unittest(OpcodeTest)