Fix test case

Author: cdce8p

Lib/test/test_capi/test_opt.py

@@ -3953,12 +3953,13 @@ def testfunc(n):
     def test_match_class(self):
         def testfunc(n):
             class A:
+                __match_args__ = ("val",)
                 val = 1
             x = A()
             ret = 0
             for _ in range(n):
                 match x:
-                    case A():
+                    case A(1):
                         ret += x.val
             return ret