Fixed #23560 -- Fixed MigrationWrite to handle builtin types without imports.

Thanks Tim Graham for the review.

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/migrations/test_writer.py b/tests/migrations/test_writer.py
index 9a04df0553..2b7ceddb2d 100644
--- a/tests/migrations/test_writer.py
+++ b/tests/migrations/test_writer.py
@@ -81,6 +81,11 @@ class WriterTests(TestCase):
         self.assertSerializedEqual(set([2, 3, "eighty"]))
         self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
         self.assertSerializedEqual(_('Hello'))
+        # Builtins
+        self.assertSerializedEqual([list, tuple, dict, set])
+        string, imports = MigrationWriter.serialize([list, tuple, dict, set])
+        self.assertEqual(string, "[list, tuple, dict, set]")
+        self.assertEqual(imports, set())
         # Functions
         with six.assertRaisesRegex(self, ValueError, 'Cannot serialize function: lambda'):
             self.assertSerializedEqual(lambda x: 42)