Address code review

Author: corona10

Lib/test/test_capi/test_opt.py

@@ -2367,19 +2367,20 @@ def testfunc(n):
     def test_store_fast_pop_top_specialize_unicode(self):
         def random_str(n):
             return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(n))
-        def testfunc(n):
-            y = random_str(32)
+        def testfunc(args):
+            a, b, n = args
+            c = ''
             for _ in range(n):
-                x = y + y # _POP_TOP
-                x = None # _POP_TOP_NOP
-
-        testfunc(TIER2_THRESHOLD)
+                c += a + b
+            return c
 
-        ex = get_first_executor(testfunc)
+        r0, r1 = random_str(32), random_str(32)
+        res, ex = self._run_with_optimizer(testfunc, (r0, r1, TIER2_THRESHOLD))
+        self.assertAlmostEqual(res, TIER2_THRESHOLD * (r0 + r1))
         self.assertIsNotNone(ex)
         uops = get_opnames(ex)
-
         self.assertIn("_POP_TOP_NOP", uops)
+        self.assertNotIn("_POP_TOP_UNICODE", uops)
 
     def test_attr_promotion_failure(self):
         # We're not testing for any specific uops here, just