first commit based on psycopg2 2.9 version

tests/test_bug_gc.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+
+# bug_gc.py - test for refcounting/GC bug
+#
+# Copyright (C) 2010-2019 Federico Di Gregorio  <fog@debian.org>
+# Copyright (C) 2020-2021 The Psycopg Team
+#
+# psycopg2 is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# In addition, as a special exception, the copyright holders give
+# permission to link this program with the OpenSSL library (or with
+# modified versions of OpenSSL that use the same license as OpenSSL),
+# and distribute linked combinations including the two.
+#
+# You must obey the GNU Lesser General Public License in all respects for
+# all of the code used other than OpenSSL.
+#
+# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+# License for more details.
+
+import psycopg2
+import psycopg2.extensions
+import unittest
+import gc
+
+from .testutils import ConnectingTestCase, skip_if_no_uuid
+
+
+class StolenReferenceTestCase(ConnectingTestCase):
+    @skip_if_no_uuid
+    def test_stolen_reference_bug(self):
+        def fish(val, cur):
+            gc.collect()
+            return 42
+        UUID = psycopg2.extensions.new_type((2950,), "UUID", fish)
+        psycopg2.extensions.register_type(UUID, self.conn)
+        curs = self.conn.cursor()
+        curs.execute("select 'b5219e01-19ab-4994-b71e-149225dc51e4'::uuid")
+        curs.fetchone()
+
+
+def test_suite():
+    return unittest.TestLoader().loadTestsFromName(__name__)
+
+
+if __name__ == "__main__":
+    unittest.main()