[1.10.x] Refs #25550 -- Corrected deprecation message for assigning M2M relations.

Backport of 5fa4370543658aedd79dc554d8c52684d6c7cbca from master

1 files changed, 11 insertions, 2 deletions

diff --git a/tests/many_to_many/tests.py b/tests/many_to_many/tests.py
index 67b3c9601e..86ffe816eb 100644
--- a/tests/many_to_many/tests.py
+++ b/tests/many_to_many/tests.py
@@ -400,15 +400,24 @@ class ManyToManyTests(TestCase):
         self.a4.publications.set([], clear=True)
         self.assertQuerysetEqual(self.a4.publications.all(), [])
 
-    def test_assign_deprecation(self):
+    def test_assign_forward_deprecation(self):
         msg = (
-            "Direct assignment to the reverse side of a related set is "
+            "Direct assignment to the reverse side of a many-to-many set is "
             "deprecated due to the implicit save() that happens. Use "
             "article_set.set() instead."
         )
         with self.assertRaisesMessage(RemovedInDjango20Warning, msg):
             self.p2.article_set = [self.a4, self.a3]
 
+    def test_assign_reverse_deprecation(self):
+        msg = (
+            "Direct assignment to the forward side of a many-to-many "
+            "set is deprecated due to the implicit save() that happens. Use "
+            "publications.set() instead."
+        )
+        with self.assertRaisesMessage(RemovedInDjango20Warning, msg):
+            self.a1.publications = [self.p1, self.p2]
+
     @ignore_warnings(category=RemovedInDjango20Warning)
     def test_assign_deprecated(self):
         self.p2.article_set = [self.a4, self.a3]