diff --git a/tests/migrations/test_questioner.py b/tests/migrations/test_questioner.py
index e17dd04ab6..9ab7756ab5 100644
--- a/tests/migrations/test_questioner.py
+++ b/tests/migrations/test_questioner.py
@@ -4,6 +4,7 @@ from unittest import mock
 from django.db.migrations.questioner import (
     InteractiveMigrationQuestioner, MigrationQuestioner,
 )
+from django.db.models import NOT_PROVIDED
 from django.test import SimpleTestCase
 from django.test.utils import captured_stdout, override_settings
 
@@ -23,3 +24,10 @@ class QuestionerTests(SimpleTestCase):
         with captured_stdout():
             value = questioner._ask_default()
         self.assertEqual(value, datetime.timedelta(days=1))
+
+    @mock.patch('builtins.input', return_value='2')
+    def test_ask_not_null_alteration_not_provided(self, mock):
+        questioner = InteractiveMigrationQuestioner()
+        with captured_stdout():
+            question = questioner.ask_not_null_alteration('field_name', 'model_name')
+        self.assertEqual(question, NOT_PROVIDED)