From 988309a1aeb3726cfa94a8e77a3f7cf7680dde97 Mon Sep 17 00:00:00 2001
From: Jon Dufresne <jon.dufresne@gmail.com>
Date: Fri, 7 Jul 2017 16:27:34 -0700
Subject: [PATCH] Added ModelFormSet test for validation of a nonexistent PK.

---
 tests/model_formsets/tests.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tests/model_formsets/tests.py b/tests/model_formsets/tests.py
index 3245bb3fd9..a34c60158b 100644
--- a/tests/model_formsets/tests.py
+++ b/tests/model_formsets/tests.py
@@ -1655,6 +1655,21 @@ class ModelFormsetTest(TestCase):
         # created.
         self.assertQuerysetEqual(Author.objects.all(), ['<Author: Charles>', '<Author: Walt>'])
 
+    def test_validation_with_nonexistent_id(self):
+        AuthorFormSet = modelformset_factory(Author, fields='__all__')
+        data = {
+            'form-TOTAL_FORMS': '1',
+            'form-INITIAL_FORMS': '1',
+            'form-MAX_NUM_FORMS': '',
+            'form-0-id': '12345',
+            'form-0-name': 'Charles',
+        }
+        formset = AuthorFormSet(data)
+        self.assertEqual(
+            formset.errors,
+            [{'id': ['Select a valid choice. That choice is not one of the available choices.']}],
+        )
+
 
 class TestModelFormsetOverridesTroughFormMeta(TestCase):
     def test_modelformset_factory_widgets(self):