Added test for refcounting/gc bug reported by Michael Tharp

psycopg2.cproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="3.5" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -170,6 +170,9 @@
     <None Include="doc\src\tools\stitch_text.py" />
     <None Include="doc\src\_static\psycopg.css" />
     <None Include="doc\src\faq.rst" />
+    <None Include="tests\test_async.py" />
+    <None Include="tests\test_copy.py" />
+    <None Include="tests\bug_gc.py" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="psycopg\adapter_asis.c" />

tests/bug_gc.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+import psycopg2
+import psycopg2.extensions
+import time
+import unittest
+import gc
+
+import sys
+if sys.version_info < (3,):
+    import tests
+else:
+    import py3tests as tests
+
+class StolenReferenceTestCase(unittest.TestCase):
+    def test_stolen_reference_bug(self):
+        def fish(val, cur):
+            gc.collect()
+            return 42
+        conn = psycopg2.connect(tests.dsn)
+        UUID = psycopg2.extensions.new_type((2950,), "UUID", fish)
+        psycopg2.extensions.register_type(UUID, conn)
+        curs = 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()