[1.8.x] Added missing tests for transforms usage with subquery for PostgreSQL fields

Backport of 2a7c59cd885b4c9f0584015c34c17c9ebca6d417 from master

2 files changed, 14 insertions, 0 deletions

diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index 35a3bffd58..0dffbaf0a2 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -223,6 +223,14 @@ class TestQuerying(TestCase):
             [instance]
         )
 
+    def test_usage_in_subquery(self):
+        self.assertSequenceEqual(
+            NullableIntegerArrayModel.objects.filter(
+                id__in=NullableIntegerArrayModel.objects.filter(field__len=3)
+            ),
+            [self.objs[3]]
+        )
+
 
 class TestChecks(TestCase):
 
diff --git a/tests/postgres_tests/test_hstore.py b/tests/postgres_tests/test_hstore.py
index b36333d90c..6063e74483 100644
--- a/tests/postgres_tests/test_hstore.py
+++ b/tests/postgres_tests/test_hstore.py
@@ -122,6 +122,12 @@ class TestQuerying(TestCase):
             self.objs[:2]
         )
 
+    def test_usage_in_subquery(self):
+        self.assertSequenceEqual(
+            HStoreModel.objects.filter(id__in=HStoreModel.objects.filter(field__a='b')),
+            self.objs[:2]
+        )
+
 
 class TestSerialization(TestCase):
     test_data = '[{"fields": {"field": "{\\"a\\": \\"b\\"}"}, "model": "postgres_tests.hstoremodel", "pk": null}]'