Fixed #21548 -- Added FileExtensionValidator and validate_image_file_extension.

1 files changed, 7 insertions, 1 deletions

diff --git a/tests/model_fields/test_imagefield.py b/tests/model_fields/test_imagefield.py
index f9ae83b8b2..51f91d90c0 100644
--- a/tests/model_fields/test_imagefield.py
+++ b/tests/model_fields/test_imagefield.py
@@ -4,7 +4,7 @@ import os
 import shutil
 from unittest import skipIf
 
-from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.core.files import File
 from django.core.files.images import ImageFile
 from django.test import TestCase
@@ -133,6 +133,12 @@ class ImageFieldTests(ImageFieldTestMixin, TestCase):
         self.assertEqual(hash(p1_db.mugshot), hash(p1.mugshot))
         self.assertIs(p1_db.mugshot != p1.mugshot, False)
 
+    def test_validation(self):
+        p = self.PersonModel(name="Joan")
+        p.mugshot.save("shot.txt", self.file1)
+        with self.assertRaisesMessage(ValidationError, "File extension 'txt' is not allowed."):
+            p.full_clean()
+
     def test_instantiate_missing(self):
         """
         If the underlying file is unavailable, still create instantiate the