Add test for Connection.__del__

Author: asvetlov

aiopg/connection.py

@@ -395,7 +395,7 @@ def echo(self):
         """Return echo mode status."""
         return self._echo
 
-    if PY_34:
+    if PY_34:  # pragma: no branch
         def __del__(self):
             if not self._conn.closed:
                 warnings.warn("Unclosed connection {!r}".format(self),

tests/test_connection.py

@@ -6,6 +6,7 @@
 import random
 import unittest
 import time
+import sys
 
 from aiopg.connection import Connection, TIMEOUT
 from aiopg.cursor import Cursor
@@ -622,3 +623,18 @@ def go():
             self.assertTrue(conn.echo)
 
         self.loop.run_until_complete(go())
+
+    @unittest.skipIf(sys.version_info < (3, 4),
+                     "Python 3.3 doesnt support __del__ calls from GC")
+    def test___del__(self):
+        @asyncio.coroutine
+        def go():
+            conn = yield from aiopg.connect(database='aiopg',
+                                            user='aiopg',
+                                            password='passwd',
+                                            host='127.0.0.1',
+                                            loop=self.loop)
+            with self.assertWarns(ResourceWarning):
+                del conn
+
+        self.loop.run_until_complete(go())