new tests for helper testing

• test all methods in helpers/testing.py

changed milestone to %Improve Test Coverage

added To Do label

changed time estimate to 15m

added Doing label and removed To Do label

assigned to @leufen1

created merge request !220 (merged) to address this issue

mentioned in merge request !220 (merged)

mentioned in commit d016cf66

took much longer, there was no test implemented, only untested calls. Futhermore the test helpers haven't been used always in the right way.

added 1h 41m of time spent at 2020-12-17

added .done label and removed Doing label

added merged in Develop label and removed .done label

closed with commit d016cf66

mentioned in commit cf6bca9d

closed with merge request !225 (merged)