Revert 961a15aff2a6, this is already checked in another way.
diff --git a/Lib/test/test_readline.py b/Lib/test/test_readline.py
index fe74939..5483dd3 100644
--- a/Lib/test/test_readline.py
+++ b/Lib/test/test_readline.py
@@ -17,9 +17,7 @@
                      "The history update test cannot be run because the "
                      "clear_history method is not available.")
     def testHistoryUpdates(self):
-        # Some GNU versions of readline do not support clear_history
-        if hasattr('readline', 'clear_history'):
-            readline.clear_history()
+        readline.clear_history()
 
         readline.add_history("first line")
         readline.add_history("second line")