wicked: test dummy interfaces

[tacerus]

Add test coverage to assess whether dummy interfaces get created successfully using either one of the three supported declaration routes to detect issues such as boo#1229555 early.

• Related ticket: n/a
• Needles: n/a
• Verification run: tbd

[tacerus]

Originally I had it in tests/wicked/startandstop/sut/ which sounded like a better place, but that suite seems to have some preliminary problems https://openqa.opensuse.org/tests/4475586#step/t01_gre_tunnel_legacy/9?
Hence I placed it in tests/wicked/basic/sut/, but there I have some issue with barriers: https://openqa.opensuse.org/tests/4475599#step/t23_dummy_ifup_ifreload/8.
Any ideas?

[cfconrad]

Thanks a lot for heads up and taking action!

The problem with the barrier is, that you parallel job doesn't have the CASEDIR set, thus the barrier for that corresponding test is not running.
If you did it with openqa-clone-job use the parameter --parental-inheritance.

I also took some time to create a test for config parsing... But I didn't submitted till now, as the fix wasn't available. I think creating such thing as a draft would be better for the next time! Plz take a look at #20193 and let's see with what kind of test we wanna continue.

[tacerus]

Thank you for the explanation and hint about --parental-inheritance, I'll remember that next time.

Indeed, a draft PR would be useful, I was checking there if someone worked on this already. ;-) But not a problem, happy to see you already having thought of it. Your solution seems to cover more scenarios, so might be a better fit than mine.