Update Lib/test/test_hmac.py

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

Author: raminfp

Lib/test/test_hmac.py

@@ -1024,13 +1024,12 @@ def test_hmac_digest_digestmod_parameter(self):
             ):
                 self.hmac_digest(b'key', b'msg', value)
 
-    def test_hmac_new_xof_digestmod(self):
+    @support.subTests("xof_name", ("shake_128", "shake_256"))
+    def test_hmac_new_xof_digestmod(self, xof_name):
         # gh-145200: XOF digests (SHAKE) are not supported by HMAC.
         # Verify that the error path does not leak the EVP_MAC_CTX.
-        for xof_name in ('shake_128', 'shake_256'):
-            with self.subTest(digestmod=xof_name):
-                with self.assertRaises(_hashlib.UnsupportedDigestmodError):
-                    self.hmac_new(b'key', digestmod=xof_name)
+        with self.assertRaises(_hashlib.UnsupportedDigestmodError):
+            self.hmac_new(b'key', digestmod=xof_name)
 
 
 class BuiltinConstructorTestCase(ThroughBuiltinAPIMixin,