Adding new-style signal/slot tests.

Based on Marcelo Lira's source code.

Reviewer: Hugo Parente Lima <hugo.lima@openbossa.org>,
          Luciano Wolf <luciano.wolf@openbossa.org>

tests/signals/ref03_test.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import unittest
+from sys import getrefcount
+from PySide.QtCore import QObject
+
+class DisconnectSignalsTest(unittest.TestCase):
+
+    def setUp(self):
+        self.emitter = QObject()
+
+    def tearDown(self):
+        del self.emitter
+
+    def testConnectionRefCount(self):
+
+        def destroyedSlot():
+            pass
+
+        self.assertEqual(getrefcount(destroyedSlot), 2)
+        self.emitter.destroyed.connect(destroyedSlot)
+        self.assertEqual(getrefcount(destroyedSlot), 3)
+        self.emitter.destroyed.disconnect(destroyedSlot)
+        self.assertEqual(getrefcount(destroyedSlot), 2)
+
+if __name__ == '__main__':
+    unittest.main()
+