Fixed #22539 -- Copied exclude argument in Model.full_clean() to prevent side effects.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/validation/tests.py b/tests/validation/tests.py
index 7f81cafccf..6122444e3d 100644
--- a/tests/validation/tests.py
+++ b/tests/validation/tests.py
@@ -59,6 +59,13 @@ class BaseModelValidationTests(ValidationTestCase):
         mtv = ModelToValidate(number=10, name='Some Name', slug='##invalid##')
         self.assertFailsValidation(mtv.full_clean, ['slug'])
 
+    def test_full_clean_does_not_mutate_exclude(self):
+        mtv = ModelToValidate(f_with_custom_validator=42)
+        exclude = ['number']
+        self.assertFailsValidation(mtv.full_clean, ['name'], exclude=exclude)
+        self.assertEqual(len(exclude), 1)
+        self.assertEqual(exclude[0], 'number')
+
 
 class ArticleForm(forms.ModelForm):
     class Meta: