Enhance the system to be able to run test differing in NullHandling more natually

[kgyrtkirk]

Motivation

Right now the CI runs the tests twice; differing only in the setting of this flag.

I have faced it several times that I was testing with value X and with Y it failed; regardless that I've run the test from the commandline as I was not setting the flag...

Description

I think any option would be interesting which could possibly run both versions of the test during the same maven execution.

[kgyrtkirk]

I think there are multiple options like:

• enhancing the testcases themselves with a rule or something to run them with useDefault and without
• enhance the build system to run these tests twice with different useDefault settings
  • there might be a caveat here if the TEST-*xml gets overwritten by the second run

there might be other options these are just my ideas