Story SW-300: finish implementing referee suggestions -> adding test

of the output functions

LCU/Maintenance/MDB_tools/test/t_probe_mdb.py

@@ -3,7 +3,7 @@ import unittest
 from datetime import datetime
 
 from mock import patch, Mock
-from output_testing import compare_output_with, compare_output_with_file_content, save_output_to_file
+from output_testing import compare_output_with_file_content
 import json
 
 from lofar.maintenance.utils.cli.probe_mdb import get_url_string_to_select_timespan, TestType, \