adds handle_error(self):raise to test modules using asyncore to provide a clearer error message in case something goes wrong

Lib/test/test_ftplib.py

@@ -48,6 +48,9 @@ class DummyDTPHandler(asynchat.async_chat):
             self.close()
             self.dtp_conn_closed = True
 
+    def handle_error(self):
+        raise
+
 
 class DummyFTPHandler(asynchat.async_chat):
 

Lib/test/test_smtplib.py

@@ -366,6 +366,9 @@ class SimSMTPChannel(smtpd.SMTPChannel):
         else:
             self.push('550 No access for you!')
 
+    def handle_error(self):
+        raise
+
 
 class SimSMTPServer(smtpd.SMTPServer):
 
@@ -384,6 +387,9 @@ class SimSMTPServer(smtpd.SMTPServer):
     def add_feature(self, feature):
         self._extra_features.append(feature)
 
+    def handle_error(self):
+        raise
+
 
 # Test various SMTP & ESMTP commands/behaviors that require a simulated server
 # (i.e., something with more features than DebuggingServer)