fix SharedKeyTests

Author: methane

Lib/test/test_descr.py

@@ -5264,7 +5264,7 @@ class B(A):
 
         a, b = A(), B()
         self.assertEqual(sys.getsizeof(vars(a)), sys.getsizeof(vars(b)))
-        self.assertLess(sys.getsizeof(vars(a)), sys.getsizeof({}))
+        self.assertLess(sys.getsizeof(vars(a)), sys.getsizeof({"a":1}))
         # Initial hash table can contain at most 5 elements.
         # Set 6 attributes to cause internal resizing.
         a.x, a.y, a.z, a.w, a.v, a.u = range(6)