remove superfluous and useless line
diff --git a/Lib/test/test_asyncio/test_unix_events.py b/Lib/test/test_asyncio/test_unix_events.py
index cc74383..744c319 100644
--- a/Lib/test/test_asyncio/test_unix_events.py
+++ b/Lib/test/test_asyncio/test_unix_events.py
@@ -1335,7 +1335,6 @@
         with self.ignore_warnings:
             self.watcher._sig_chld()
 
-        callback.assert_called(m.waitpid)
         if isinstance(self.watcher, asyncio.FastChildWatcher):
             # here the FastChildWatche enters a deadlock
             # (there is no way to prevent it)