diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 4563374..2062838 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -567,6 +567,9 @@
         # string
         self.check_sizeof('', h + l + self.align(i + 1))
         self.check_sizeof('abc', h + l + self.align(i + 1) + 3)
+        # tuple
+        self.check_sizeof((), h)
+        self.check_sizeof((1,2,3), h + 3*p)
 
 
 def test_main():