Document all function in test headers properly #2153
Description
Feature request
Is your feature request related to a problem? Please describe.
Some of our function in the test helper headers are not documented properly.
Describe the solution or feature you'd like
Activate the doxygen check for them (see parent issue) and fix all warning.
Describe alternatives you've considered
None
Estimated priority
"Priority: medium" Should be solved within half a year
Additional context
None