Refs #25735 -- Made @tag decorator importable from django.test.

django/test/__init__.py

@@ -9,14 +9,14 @@ from django.test.testcases import (
 )
 from django.test.utils import (
     ignore_warnings, modify_settings, override_settings,
-    override_system_checks,
+    override_system_checks, tag,
 )
 
 __all__ = [
     'Client', 'RequestFactory', 'TestCase', 'TransactionTestCase',
     'SimpleTestCase', 'LiveServerTestCase', 'skipIfDBFeature',
     'skipUnlessAnyDBFeature', 'skipUnlessDBFeature', 'ignore_warnings',
-    'modify_settings', 'override_settings', 'override_system_checks'
+    'modify_settings', 'override_settings', 'override_system_checks', 'tag',
 ]
 
 # To simplify Django's test suite; not meant as a public API

docs/topics/testing/tools.txt

@@ -1632,7 +1632,7 @@ Tagging tests
 You can tag your tests so you can easily run a particular subset. For example,
 you might label fast or slow tests::
 
-    from django.test.utils import tag
+    from django.test import tag
 
     class SampleTestCase(TestCase):
 

tests/test_discovery_sample/tests_sample.py

 import doctest
 from unittest import TestCase
 
-from django.test import SimpleTestCase, TestCase as DjangoTestCase
-from django.test.utils import tag
+from django.test import SimpleTestCase, TestCase as DjangoTestCase, tag
 
 from . import doctests