site_tests.py: Silence the expected UserWarning of TestObsoleteSite

Change-Id: I6b79f33b1db0843e246fbc9f970c7ea654ea655b
---
M tests/site_tests.py
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tests/site_tests.py b/tests/site_tests.py
index cfaa47e..748b612 100644
--- a/tests/site_tests.py
+++ b/tests/site_tests.py
@@ -31,7 +31,7 @@
     UnicodeType as unicode,
 )
 
-from tests import unittest_print
+from tests import patch, unittest_print
 from tests.aspects import (
     unittest, TestCase, DeprecationTestCase,
     TestCaseBase,
@@ -3320,6 +3320,15 @@
         },
     }
 
+    @classmethod
+    def setUpClass(cls):
+        """Setup the class."""
+        with patch.object(pywikibot, 'warn') as warn_mock:
+            super(TestObsoleteSite, cls).setUpClass()
+        warn_mock.assert_called_once_with(
+            'Site wikipedia:ja instantiated using different code "jp"',
+            UserWarning, 2)
+
     def test_locked_site(self):
         """Test Wikimedia closed/locked site."""
         site = self.get_site('mhwp')

