Fixed #20403 -- Ignore forms marked for deletion when validating max_num.

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/forms_tests/tests/test_formsets.py b/tests/forms_tests/tests/test_formsets.py
index 31adb921ba..787f177677 100644
--- a/tests/forms_tests/tests/test_formsets.py
+++ b/tests/forms_tests/tests/test_formsets.py
@@ -986,6 +986,24 @@ class FormsFormsetTestCase(TestCase):
         self.assertEqual(list(formset.non_form_errors()),
             ['This is a non-form error'])
 
+    def test_validate_max_ignores_forms_marked_for_deletion(self):
+        class CheckForm(Form):
+           field = IntegerField()
+
+        data = {
+            'check-TOTAL_FORMS': '2',
+            'check-INITIAL_FORMS': '0',
+            'check-MAX_NUM_FORMS': '1',
+            'check-0-field': '200',
+            'check-0-DELETE': '',
+            'check-1-field': '50',
+            'check-1-DELETE': 'on',
+        }
+        CheckFormSet = formset_factory(CheckForm, max_num=1, validate_max=True,
+                                       can_delete=True)
+        formset = CheckFormSet(data, prefix='check')
+        self.assertTrue(formset.is_valid())
+
 
 data = {
     'choices-TOTAL_FORMS': '1', # the number of forms rendered