windows - Why does my Python unittest test case with threads hang? -

i have following test case. note following test case not trying test trying demonstrate hanging issue encountering.

import http.server import urllib.request import threading import unittest  class footest(unittest.testcase):     def setup(self):         print('---- setup start')         self.httpd = http.server.httpserver(('', 8080), http.server.simplehttprequesthandler)         thread = threading.thread(target=self.httpd.serve_forever)         thread.start()         print('---- setup complete')      def teardown(self):         print('---- teardown start')         self.httpd.shutdown()         print('---- teardown complete')      def test1(self):         print('---- test1 start')         print(threading.current_thread())         urllib.request.urlopen('http://127.0.0.1:8080/foo')         print('---- test1 complete')      def test2(self):         print('---- test2 start')         print(threading.current_thread())         urllib.request.urlopen('http://127.0.0.1:8080/foo')         print('---- test2 complete')  if __name__ == '__main__':     unittest.main() 

i expect 2 errors when try execute test case. instead, test case hangs after following output.

c:\lab>python foo.py -v test1 (__main__.footest) ... ---- setup start ---- setup complete ---- test1 start <_mainthread(mainthread, started 12980)> 127.0.0.1 - - [24/mar/2014 21:53:57] code 404, message file not found 127.0.0.1 - - [24/mar/2014 21:53:57] "get /foo http/1.1" 404 - ---- teardown start ---- teardown complete error test2 (__main__.footest) ... ---- setup start ---- setup complete ---- test2 start <_mainthread(mainthread, started 12980)> 

if remove test2 code, expect 1 error , sure enough see it.

c:\lab>python foo.py -v test1 (__main__.footest) ... ---- setup start ---- setup complete ---- test1 start <_mainthread(mainthread, started 15720)> 127.0.0.1 - - [24/mar/2014 21:55:12] code 404, message file not found 127.0.0.1 - - [24/mar/2014 21:55:12] "get /foo http/1.1" 404 - ---- teardown start ---- teardown complete error  ====================================================================== error: test1 (__main__.footest) ---------------------------------------------------------------------- traceback (most recent call last):   file "foo.py", line 22, in test1     urllib.request.urlopen('http://127.0.0.1:8080/foo')   file "c:\python34\lib\urllib\request.py", line 153, in urlopen     return opener.open(url, data, timeout)   file "c:\python34\lib\urllib\request.py", line 461, in open     response = meth(req, response)   file "c:\python34\lib\urllib\request.py", line 574, in http_response     'http', request, response, code, msg, hdrs)   file "c:\python34\lib\urllib\request.py", line 499, in error     return self._call_chain(*args)   file "c:\python34\lib\urllib\request.py", line 433, in _call_chain     result = func(*args)   file "c:\python34\lib\urllib\request.py", line 582, in http_error_default     raise httperror(req.full_url, code, msg, hdrs, fp) urllib.error.httperror: http error 404: file not found  ---------------------------------------------------------------------- ran 1 test in 0.032s  failed (errors=1) 

why test case hang if there 2 tests errors?

add call server_close close socket:

def setup(self):     print('---- setup start')     handler = http.server.simplehttprequesthandler     self.httpd = http.server.httpserver(('', 8080), handler)     threading.thread(target=self.serve).start()     print('---- setup complete')  def serve(self):     try:         self.httpd.serve_forever()     finally:         self.httpd.server_close()