[1.8.x] Fixed #24751 -- Fixed HStoreField isnull lookup.

Backport of 3c8fe5dddf34533a419d2deed5208a28de32cb4a from master

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/postgres_tests/test_hstore.py b/tests/postgres_tests/test_hstore.py
index 06544163f8..8b2cc883dc 100644
--- a/tests/postgres_tests/test_hstore.py
+++ b/tests/postgres_tests/test_hstore.py
@@ -110,6 +110,17 @@ class TestQuerying(TestCase):
             self.objs[:3]
         )
 
+    def test_key_isnull(self):
+        obj = HStoreModel.objects.create(field={'a': None})
+        self.assertSequenceEqual(
+            HStoreModel.objects.filter(field__a__isnull=True),
+            self.objs[2:5] + [obj]
+        )
+        self.assertSequenceEqual(
+            HStoreModel.objects.filter(field__a__isnull=False),
+            self.objs[:2]
+        )
+
 
 class TestSerialization(TestCase):
     test_data = '[{"fields": {"field": "{\\"a\\": \\"b\\"}"}, "model": "postgres_tests.hstoremodel", "pk": null}]'