Forgot to add the file before the previous commit, here go

the ftplib tests.

Lib/test/test_ftplib.py

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+import socket
+import threading
+import ftplib
+import time
+
+from unittest import TestCase
+from test import test_support
+
+def server(evt):
+    serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    serv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    serv.bind(("", 9091))
+    serv.listen(5)
+    conn, addr = serv.accept()
+    conn.send("1 Hola mundo\n")
+    conn.close()
+    serv.close()
+    evt.set()
+
+class GeneralTests(TestCase):
+    
+    def setUp(self):
+        ftplib.FTP.port = 9091
+        self.evt = threading.Event()
+        threading.Thread(target=server, args=(self.evt,)).start()
+        time.sleep(.1)
+
+    def tearDown(self):
+        self.evt.wait()
+
+    def testBasic(self):
+        # do nothing
+        ftplib.FTP()
+
+        # connects
+        ftp = ftplib.FTP("localhost")
+        ftp.sock.close()
+        
+    def testTimeoutDefault(self):
+        # default
+        ftp = ftplib.FTP("localhost")
+        self.assertTrue(ftp.sock.gettimeout() is None)
+        ftp.sock.close()
+    
+    def testTimeoutValue(self):
+        # a value
+        ftp = ftplib.FTP("localhost", timeout=30)
+        self.assertEqual(ftp.sock.gettimeout(), 30)
+        ftp.sock.close()
+
+    def testTimeoutNone(self):
+        # None, having other default
+        previous = socket.getdefaulttimeout()
+        socket.setdefaulttimeout(30)
+        try:
+            ftp = ftplib.FTP("localhost", timeout=None)
+        finally:
+            socket.setdefaulttimeout(previous)
+        self.assertEqual(ftp.sock.gettimeout(), 30)
+        ftp.close()
+
+
+
+def test_main(verbose=None):
+    test_support.run_unittest(GeneralTests)
+
+if __name__ == '__main__':
+    test_main()