Improvements in test 2

Author: efimov-mikhail

Lib/test/test_stackrefs.py

@@ -50,15 +50,15 @@ def run_with_refcount_check(self, func, obj):
             for func in funcs_with_incref:
                 refcount, flags = run_with_refcount_check(self, func, obj)
                 self.assertLess(refcount, self.BIG_REFCOUNT)
-                self.assertEqual(flags, 0)
+                self.assertIn(flags, (0, -1))
                 results.add((refcount, flags))
             self.assertEqual(len(results), 1)
 
             results = set()
             for func in funcs_with_borrow:
                 refcount, flags = run_with_refcount_check(self, func, obj)
                 self.assertLess(refcount, self.BIG_REFCOUNT)
-                self.assertEqual(flags, 1)
+                self.assertIn(flags, (1, -1))
                 results.add((refcount, flags))
             self.assertEqual(len(results), 1)