Hello, I have a routine that sends an email (this is how a Django view notifies me that an event has happened). I want to unit test that routine. So I gave each mail a unique subject line and I want to use python's mailbox package to look for that subject. But sometimes the mail gets delivered and sometimes it does not (I use sendmail to send it but I believe that it is always sent since I can see an entry in the mail log).
I thought that the mail delivery system was occasionally hitting my mailbox lock, and that I needed to first sleep for a while. So I wrote a test that sleeps, then grabs the mailbox and looks through it, and if the mail is not there then it sleeps again, etc., for up to ten tries. It is below. However, I find that if the mail is not delivered on the first try then it is never delivered, no matter how long I wait. So I think I am doing mailbox wrong but I don't see how. The real puzzler for me is that the test reliably fails every third time. For instance, if I try it six times then it succeeds the first, second, fourth, and fifth times. I have to say that I cannot understand this at all but it certainly makes the unit test useless. I'm using Python 2.6 on an Ubuntu system. If anyone could give me a pointer to why the mail is not delivered, I sure could use it. Thanks, Jim ................................................................... class sendEmail_test(unittest.TestCase): """Test sendEmail() """ config = ConfigParser.ConfigParser() config.read(CONFIG_FN) mailbox_fn=config.get('testing','mailbox') def look_in_mailbox(self,uniquifier='123456789'): """If the mailbox has a message whose subject line contains the given uniquifier then it returns that message and deletes it. Otherwise, returns None. """ sleep_time=10.0 # wait for message to be delivered? message_found=None i=0 while i<10 and not(message_found): time.sleep(sleep_time) m=mailbox.mbox(self.mailbox_fn) try: m.lock() except Exception, err: print "trouble locking the mailbox: "+str(err) try: for key,message in m.items(): subject=message['Subject'] or '' print "subject is ",subject if subject.find(uniquifier)>-1: print "+++found the message+++ i=",str(i) message_found=message m.remove(key) break m.flush() except Exception, err: print "trouble reading from the mailbox: "+str(err) m.unlock() try: m.unlock() except Exception, err: print "trouble unlocking the mailbox: "+str(err) try: m.close() except Exception, err: print "trouble closing the mailbox: "+str(err) del m i+=1 return message_found def test_mailbox(self): random.seed() uniquifier=str(int(random.getrandbits(20))) print "uniquifier is ",uniquifier # looks different every time to me rc=az_view.sendEmail(uniquifier=uniquifier) if rc: self.fail('rc is not None: '+str(rc)) found=self.look_in_mailbox(uniquifier) if not(found): self.fail('message not found') print "done" -- http://mail.python.org/mailman/listinfo/python-list