Specify parameters to have the test not skip them.

Author: acolomb

test/test_pdo.py

@@ -66,7 +66,10 @@ def test_pdo_save(self):
 
     def test_pdo_save_skip_readonly(self):
         """Expect no exception when a record entry is not writable."""
+        # Saving only happens with a defined COB ID and for specified parameters
         self.node.tpdo[1].cob_id = self.node.tpdo[1].predefined_cob_id
+        self.node.tpdo[1].trans_type = 1
+        self.node.tpdo[1].inhibit_time = 10
         self.node.tpdo[1].com_record[2].od.access_type = "r"
         self.node.tpdo[1].save()