[2.1.x] Fixed #29469 -- Added a helpful makemigrations error if app_label contains dots.

Backport of 78972af367a1da54aa7e539e4b1ffa2b56571e77 from master

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/migrations/test_commands.py b/tests/migrations/test_commands.py
index 933c00eada..76b8e39b17 100644
--- a/tests/migrations/test_commands.py
+++ b/tests/migrations/test_commands.py
@@ -786,6 +786,12 @@ class MakeMigrationsTests(MigrationTestBase):
             call_command("makemigrations", "this_app_does_not_exist", stderr=err)
         self.assertIn("'this_app_does_not_exist' could not be found.", err.getvalue())
 
+    def test_makemigrations_app_name_with_dots(self):
+        err = io.StringIO()
+        with self.assertRaises(SystemExit):
+            call_command('makemigrations', 'invalid.app.label', stderr=err)
+        self.assertIn("'invalid.app.label' is not a valid app label. Did you mean 'label'?", err.getvalue())
+
     def test_makemigrations_empty_no_app_specified(self):
         """
         makemigrations exits if no app is specified with 'empty' mode.