Add check_node_label unit test

[simonklb]

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• Fixes #

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[simonklb]

Couldn't source it in setup() because then $config wasn't defined and with_kubeconfig failed. Do any of you know how to fix that?

[aarnq]

It feels like we need to do some larger rework to make it better for testing in general.
bin/common.bash expects too much.

[simonklb]

Alright, let's go with this for now then?

[Zash]

Great to have more tests!

[lucianvlad]

Does this need anything else before merging?
If not would be nice to merge it 😃

[simonklb]

Does this need anything else before merging? If not would be nice to merge it 😃

Oops, no idea how I missed this. Thanks for the ping 😄