skip in py2-compatible way :(

src/wormhole_mailbox_server/test/test_server.py

@@ -2,7 +2,7 @@
 import mock
 import subprocess
 import packaging.version
-from unittest import skipIf
+from unittest import SkipTest
 
 from twisted.trial import unittest
 from twisted.python import log
@@ -655,12 +655,15 @@ def test_default_permission(self):
         )
 
 
-@skipIf(packaging.version.parse(autobahn.version) <= packaging.version.parse("22.6.1"), "need newer Autobahn to run this test")
 class PermissionsServer(unittest.TestCase):
     """
     Test operation of the WebSocket permissions / submit-permissions.
     """
 
+    def setUp(self):
+        if packaging.version.parse(autobahn.version) <= packaging.version.parse("22.6.1"):
+            raise SkipTest("need newer Autobahn to run this test")
+
     @inlineCallbacks
     def test_submit_success(self):
         """