Fixed some Signal.disconnect calls from 058e4340.

This would go unnoticed by the test suite because receivers are removed
automatically when they are garbage collected.

Changed all Signal.connect calls to hold strong references to ensure we
clean up after ourselves.

tests/signals/tests.py

@@ -43,8 +43,8 @@ class SignalTests(TestCase):
                 (instance, kwargs.get("created"), kwargs.get("raw", False))
             )
 
-        signals.pre_save.connect(pre_save_handler)
-        signals.post_save.connect(post_save_handler)
+        signals.pre_save.connect(pre_save_handler, weak=False)
+        signals.post_save.connect(post_save_handler, weak=False)
         try:
             p1 = Person.objects.create(first_name="John", last_name="Smith")
 
@@ -85,8 +85,8 @@ class SignalTests(TestCase):
                 (p2, True, False),
             ])
         finally:
-            signals.post_delete.disconnect(pre_save_handler)
-            signals.pre_delete.disconnect(post_save_handler)
+            signals.pre_save.disconnect(pre_save_handler)
+            signals.post_save.disconnect(post_save_handler)
 
     def test_delete_signals(self):
         data = []
@@ -107,8 +107,8 @@ class SignalTests(TestCase):
                 )
         post_delete_handler = PostDeleteHandler(data)
 
-        signals.pre_delete.connect(pre_delete_handler)
-        signals.post_delete.connect(post_delete_handler)
+        signals.pre_delete.connect(pre_delete_handler, weak=False)
+        signals.post_delete.connect(post_delete_handler, weak=False)
         try:
             p1 = Person.objects.create(first_name="John", last_name="Smith")
             p1.delete()
@@ -137,17 +137,17 @@ class SignalTests(TestCase):
                 six.text_type
             )
         finally:
-            signals.post_delete.disconnect(pre_delete_handler)
-            signals.pre_delete.disconnect(post_delete_handler)
+            signals.pre_delete.disconnect(pre_delete_handler)
+            signals.post_delete.disconnect(post_delete_handler)
 
     def test_decorators(self):
         data = []
 
-        @receiver(signals.pre_save)
+        @receiver(signals.pre_save, weak=False)
         def decorated_handler(signal, sender, instance, **kwargs):
             data.append(instance)
 
-        @receiver(signals.pre_save, sender=Car)
+        @receiver(signals.pre_save, sender=Car, weak=False)
         def decorated_handler_with_sender_arg(signal, sender, instance, **kwargs):
             data.append(instance)
 
@@ -155,8 +155,8 @@ class SignalTests(TestCase):
             c1 = Car.objects.create(make="Volkswagon", model="Passat")
             self.assertEqual(data, [c1, c1])
         finally:
-            signals.post_delete.disconnect(decorated_handler)
-            signals.pre_delete.disconnect(decorated_handler_with_sender_arg, sender=Car)
+            signals.pre_save.disconnect(decorated_handler)
+            signals.pre_save.disconnect(decorated_handler_with_sender_arg, sender=Car)
 
     def test_save_and_delete_signals_with_m2m(self):
         data = []
@@ -177,17 +177,17 @@ class SignalTests(TestCase):
                 data.append('Is raw')
 
         def pre_delete_handler(signal, sender, instance, **kwargs):
-            data.append('pre_save signal, %s' % instance)
+            data.append('pre_delete signal, %s' % instance)
             data.append('instance.id is not None: %s' % (instance.id is not None))
 
         def post_delete_handler(signal, sender, instance, **kwargs):
             data.append('post_delete signal, %s' % instance)
             data.append('instance.id is not None: %s' % (instance.id is not None))
 
-        signals.pre_save.connect(pre_save_handler)
-        signals.post_save.connect(post_save_handler)
-        signals.pre_delete.connect(pre_delete_handler)
-        signals.post_delete.connect(post_delete_handler)
+        signals.pre_save.connect(pre_save_handler, weak=False)
+        signals.post_save.connect(post_save_handler, weak=False)
+        signals.pre_delete.connect(pre_delete_handler, weak=False)
+        signals.post_delete.connect(post_delete_handler, weak=False)
         try:
             a1 = Author.objects.create(name='Neal Stephenson')
             self.assertEqual(data, [
@@ -211,10 +211,10 @@ class SignalTests(TestCase):
             b1.authors = []
             self.assertEqual(data, [])
         finally:
-            signals.post_delete.disconnect(pre_save_handler)
-            signals.pre_delete.disconnect(post_save_handler)
-            signals.post_save.disconnect(pre_delete_handler)
-            signals.pre_save.disconnect(post_delete_handler)
+            signals.pre_save.disconnect(pre_save_handler)
+            signals.post_save.disconnect(post_save_handler)
+            signals.pre_delete.disconnect(pre_delete_handler)
+            signals.post_delete.disconnect(post_delete_handler)
 
     def test_disconnect_in_dispatch(self):
         """
@@ -232,8 +232,8 @@ class SignalTests(TestCase):
                 signal.disconnect(receiver=self, sender=sender)
 
         a, b = Handler(1), Handler(2)
-        signals.post_save.connect(sender=Person, receiver=a)
-        signals.post_save.connect(sender=Person, receiver=b)
+        signals.post_save.connect(a, sender=Person, weak=False)
+        signals.post_save.connect(b, sender=Person, weak=False)
         Person.objects.create(first_name='John', last_name='Smith')
 
         self.assertTrue(a._run)