--- urlgrabber-urlgrabber-4-1-0/test/test_mirror.py.orig	2020-11-16 18:47:43.724337579 +0100
+++ urlgrabber-urlgrabber-4-1-0/test/test_mirror.py	2020-11-16 18:47:57.724337574 +0100
@@ -290,6 +290,7 @@
             self.exit = False
 
         self.thread = threading.Thread(target=server)
+        self.thread.daemon = True
         self.thread.start()
 
         # create grabber and mirror group objects
