Fixed #28334 -- Added caching for hstore/citext OIDs.

tests/postgres_tests/test_signals.py

@@ -0,0 +1,33 @@
+from django.db import connection
+
+from . import PostgreSQLTestCase
+
+try:
+    from django.contrib.postgres.signals import get_hstore_oids, get_citext_oids
+except ImportError:
+    pass  # pyscogp2 isn't installed.
+
+
+class OIDTests(PostgreSQLTestCase):
+
+    def assertOIDs(self, oids):
+        self.assertIsInstance(oids, tuple)
+        self.assertGreater(len(oids), 0)
+        self.assertTrue(all(isinstance(oid, int) for oid in oids))
+
+    def test_hstore_cache(self):
+        with self.assertNumQueries(0):
+            get_hstore_oids(connection.alias)
+
+    def test_citext_cache(self):
+        with self.assertNumQueries(0):
+            get_citext_oids(connection.alias)
+
+    def test_hstore_values(self):
+        oids, array_oids = get_hstore_oids(connection.alias)
+        self.assertOIDs(oids)
+        self.assertOIDs(array_oids)
+
+    def test_citext_values(self):
+        oids = get_citext_oids(connection.alias)
+        self.assertOIDs(oids)