Fixed #30261 -- Prevented Form._html_output() from mutating errors if hidden fields have errors.

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index e4a8127e15..b62b32de4b 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -1245,6 +1245,22 @@ value="Should escape < & > and <script>alert('xss')&lt
         self.assertTrue(f.has_error(NON_FIELD_ERRORS, 'password_mismatch'))
         self.assertFalse(f.has_error(NON_FIELD_ERRORS, 'anything'))
 
+    def test_html_output_with_hidden_input_field_errors(self):
+        class TestForm(Form):
+            hidden_input = CharField(widget=HiddenInput)
+
+            def clean(self):
+                self.add_error(None, 'Form error')
+
+        f = TestForm(data={})
+        error_dict = {
+            'hidden_input': ['This field is required.'],
+            '__all__': ['Form error'],
+        }
+        self.assertEqual(f.errors, error_dict)
+        f.as_table()
+        self.assertEqual(f.errors, error_dict)
+
     def test_dynamic_construction(self):
         # It's possible to construct a Form dynamically by adding to the self.fields
         # dictionary in __init__(). Don't forget to call Form.__init__() within the