Refs #29600 -- Added test for datetime_safe usage in SelectDateWidget.value_from_datadict().

tests/forms_tests/widget_tests/test_selectdatewidget.py

@@ -477,6 +477,12 @@ class SelectDateWidgetTest(WidgetTest):
             w.value_from_datadict({'date_year': '1899', 'date_month': '8', 'date_day': '13'}, {}, 'date'),
             '13-08-1899',
         )
+        # And years before 1000 (demonstrating the need for datetime_safe).
+        w = SelectDateWidget(years=('0001',))
+        self.assertEqual(
+            w.value_from_datadict({'date_year': '0001', 'date_month': '8', 'date_day': '13'}, {}, 'date'),
+            '13-08-0001',
+        )
 
     def test_format_value(self):
         valid_formats = [