[pitivi] Add an env variable to turn off reference leaks.

[Edward Hervey <edwardrv src gnome org>]

commit 2a7a7945a92e068be928d609ddef05205f2ee492
Author: Alessandro Decina <alessandro d gmail com>
Date:   Thu Aug 27 14:55:31 2009 +0200

    Add an env variable to turn off reference leaks.

 tests/common.py |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/tests/common.py b/tests/common.py
index 6ff05ec..e4db30f 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -5,11 +5,14 @@ A collection of objects to use for testing
 import gobject
 gobject.threads_init()
 import gst
+import os
 import gc
 import unittest
 from pitivi.factories.base import ObjectFactory, SourceFactory, SinkFactory
 from pitivi.pipeline import Pipeline
 
+detect_leaks = os.environ.get("PITIVI_TEST_DETECT_LEAKS", "1") not in ("0", "")
+
 class TestCase(unittest.TestCase):
     _tracked_types = (gst.MiniObject, gst.Element, gst.Pad, gst.Caps,
             ObjectFactory, Pipeline)
@@ -55,11 +58,13 @@ class TestCase(unittest.TestCase):
         del self._tracked
 
     def setUp(self):
-        self.gctrack()
+        if detect_leaks:
+            self.gctrack()
 
     def tearDown(self):
-        self.gccollect()
-        self.gcverify()
+        if detect_leaks:
+            self.gccollect()
+            self.gcverify()
 
 # Some fake factories
 class FakeSourceFactory(SourceFactory):