Refs #32594 -- Added Signal.disconnect() test with a model class.

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>

tests/signals/tests.py

@@ -280,6 +280,31 @@ class SignalTests(BaseSignalSetup, TestCase):
         signals.pre_init.disconnect(callback)
         ref.assert_not_called()
 
+    @isolate_apps('signals', kwarg_name='apps')
+    def test_disconnect_model(self, apps):
+        received = []
+
+        def receiver(**kwargs):
+            received.append(kwargs)
+
+        class Created(models.Model):
+            pass
+
+        signals.post_init.connect(receiver, sender=Created, apps=apps)
+        try:
+            self.assertIs(
+                signals.post_init.disconnect(receiver, sender=Created, apps=apps),
+                True,
+            )
+            self.assertIs(
+                signals.post_init.disconnect(receiver, sender=Created, apps=apps),
+                False,
+            )
+            Created()
+            self.assertEqual(received, [])
+        finally:
+            signals.post_init.disconnect(receiver, sender=Created)
+
 
 class LazyModelRefTests(BaseSignalSetup, SimpleTestCase):
     def setUp(self):