Extend tests to cover iteration over PdoMap.

Author: acolomb

test/test_pdo.py

@@ -81,6 +81,9 @@ def test_pdo_maps_iterate(self):
         self.assertEqual(len(node.tpdo), sum(1 for _ in node.tpdo))
         self.assertEqual(len(node.rpdo), sum(1 for _ in node.rpdo))
 
+        pdo = node.tpdo[1]
+        self.assertEqual(len(pdo), sum(1 for _ in pdo))
+
     def test_pdo_save(self):
         self.node.tpdo.save()
         self.node.rpdo.save()