Speed up this test by about 99%. Remove sleeps and replace with events.

(This may fail on some slow platforms, but we can fix those cases which
should be relatively isolated and easier to find now.)
Move two test cases that didn't require a server to be started
to a separate TestCase.  These tests were taking 3 seconds which
is what the timeout was set to.

Lib/test/test_smtplib.py

@@ -18,14 +18,15 @@ HOST = "localhost"
 PORT = None
 
 def server(evt, buf):
+    serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    serv.settimeout(1)
+    serv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    serv.bind(("", 0))
+    global PORT
+    PORT = serv.getsockname()[1]
+    serv.listen(5)
+    evt.set()
     try:
-        serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        serv.settimeout(3)
-        serv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        serv.bind(("", 0))
-        global PORT
-        PORT = serv.getsockname()[1]
-        serv.listen(5)
         conn, addr = serv.accept()
     except socket.timeout:
         pass
@@ -38,7 +39,6 @@ def server(evt, buf):
                 buf = buf[sent:]
 
             n -= 1
-            time.sleep(0.01)
 
         conn.close()
     finally:
@@ -52,16 +52,8 @@ class GeneralTests(TestCase):
         self.evt = threading.Event()
         servargs = (self.evt, "220 Hola mundo\n")
         threading.Thread(target=server, args=servargs).start()
-
-        # wait until server thread has assigned a port number
-        n = 500
-        while PORT is None and n > 0:
-            time.sleep(0.01)
-            n -= 1
-
-        # wait a little longer (sometimes connections are refused
-        # on slow machines without this additional wait)
-        time.sleep(0.5)
+        self.evt.wait()
+        self.evt.clear()
 
     def tearDown(self):
         self.evt.wait()
@@ -76,29 +68,12 @@ class GeneralTests(TestCase):
         smtp = smtplib.SMTP("%s:%s" % (HOST, PORT))
         smtp.sock.close()
 
-    def testNotConnected(self):
-        # Test various operations on an unconnected SMTP object that
-        # should raise exceptions (at present the attempt in SMTP.send
-        # to reference the nonexistent 'sock' attribute of the SMTP object
-        # causes an AttributeError)
-        smtp = smtplib.SMTP()
-        self.assertRaises(smtplib.SMTPServerDisconnected, smtp.ehlo)
-        self.assertRaises(smtplib.SMTPServerDisconnected,
-                          smtp.send, 'test msg')
-
     def testLocalHostName(self):
         # check that supplied local_hostname is used
         smtp = smtplib.SMTP(HOST, PORT, local_hostname="testhost")
         self.assertEqual(smtp.local_hostname, "testhost")
         smtp.sock.close()
 
-    def testNonnumericPort(self):
-        # check that non-numeric port raises socket.error
-        self.assertRaises(socket.error, smtplib.SMTP,
-                          "localhost", "bogus")
-        self.assertRaises(socket.error, smtplib.SMTP,
-                          "localhost:bogus")
-
     def testTimeoutDefault(self):
         # default
         smtp = smtplib.SMTP(HOST, PORT)
@@ -128,6 +103,7 @@ def debugging_server(server_class, serv_evt, client_evt):
     serv = server_class(("", 0), ('nowhere', -1))
     global PORT
     PORT = serv.getsockname()[1]
+    serv_evt.set()
 
     try:
         if hasattr(select, 'poll'):
@@ -150,12 +126,12 @@ def debugging_server(server_class, serv_evt, client_evt):
     except socket.timeout:
         pass
     finally:
-        # allow some time for the client to read the result
-        time.sleep(0.5)
-        serv.close()
+        if not client_evt.isSet():
+            # allow some time for the client to read the result
+            time.sleep(0.5)
+            serv.close()
         asyncore.close_all()
         PORT = None
-        time.sleep(0.5)
         serv_evt.set()
 
 MSG_BEGIN = '---------- MESSAGE FOLLOWS ----------\n'
@@ -181,14 +157,8 @@ class DebuggingServerTests(TestCase):
         threading.Thread(target=debugging_server, args=serv_args).start()
 
         # wait until server thread has assigned a port number
-        n = 500
-        while PORT is None and n > 0:
-            time.sleep(0.01)
-            n -= 1
-
-        # wait a little longer (sometimes connections are refused
-        # on slow machines without this additional wait)
-        time.sleep(0.5)
+        self.serv_evt.wait()
+        self.serv_evt.clear()
 
     def tearDown(self):
         # indicate that the client is finished
@@ -258,6 +228,26 @@ class DebuggingServerTests(TestCase):
         self.assertEqual(self.output.getvalue(), mexpect)
 
 
+class NonConnectingTests(TestCase):
+
+    def testNotConnected(self):
+        # Test various operations on an unconnected SMTP object that
+        # should raise exceptions (at present the attempt in SMTP.send
+        # to reference the nonexistent 'sock' attribute of the SMTP object
+        # causes an AttributeError)
+        smtp = smtplib.SMTP()
+        self.assertRaises(smtplib.SMTPServerDisconnected, smtp.ehlo)
+        self.assertRaises(smtplib.SMTPServerDisconnected,
+                          smtp.send, 'test msg')
+
+    def testNonnumericPort(self):
+        # check that non-numeric port raises socket.error
+        self.assertRaises(socket.error, smtplib.SMTP,
+                          "localhost", "bogus")
+        self.assertRaises(socket.error, smtplib.SMTP,
+                          "localhost:bogus")
+
+
 # test response of client to a non-successful HELO message
 class BadHELOServerTests(TestCase):
 
@@ -269,16 +259,8 @@ class BadHELOServerTests(TestCase):
         self.evt = threading.Event()
         servargs = (self.evt, "199 no hello for you!\n")
         threading.Thread(target=server, args=servargs).start()
-
-        # wait until server thread has assigned a port number
-        n = 500
-        while PORT is None and n > 0:
-            time.sleep(0.01)
-            n -= 1
-
-        # wait a little longer (sometimes connections are refused
-        # on slow machines without this additional wait)
-        time.sleep(0.5)
+        self.evt.wait()
+        self.evt.clear()
 
     def tearDown(self):
         self.evt.wait()
@@ -355,14 +337,8 @@ class SMTPSimTests(TestCase):
         threading.Thread(target=debugging_server, args=serv_args).start()
 
         # wait until server thread has assigned a port number
-        n = 500
-        while PORT is None and n > 0:
-            time.sleep(0.01)
-            n -= 1
-
-        # wait a little longer (sometimes connections are refused
-        # on slow machines without this additional wait)
-        time.sleep(0.5)
+        self.serv_evt.wait()
+        self.serv_evt.clear()
 
     def tearDown(self):
         # indicate that the client is finished
@@ -427,6 +403,7 @@ class SMTPSimTests(TestCase):
 
 def test_main(verbose=None):
     test_support.run_unittest(GeneralTests, DebuggingServerTests,
+                              NonConnectingTests,
                               BadHELOServerTests, SMTPSimTests)
 
 if __name__ == '__main__':