Add unit tests for the obs.go file.

[TatianaSelezneva]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

We are missing unit tests for krel obs and this PR attempts to improve coverage
Relevant card from the project board: #3168

Which issue(s) this PR fixes:

It improves unit test coverage for the krel obs

Special notes for your reviewer:

The pattern for tests has been borrowed from anago_test.go file as code looks very similar.
While structure is the same, test cases have been tailored for the obs package.

Does this PR introduce a user-facing change?

NONE

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: TatianaSelezneva
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[k8s-ci-robot]

Hi @TatianaSelezneva. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[TatianaSelezneva]

@xmudrii , I'm wondering if you could please have a look? It adds unit tests for obs.go file, a first step towards completing #3168.

To complete the card more unit tests are required, but I would prefer to avoid big PRs if I can, plus it would be good to get a feedback to understand if I'm moving in the right direction.

Thank you!

[xmudrii]

@TatianaSelezneva I didn't forget about this, it's in my inbox, but I'm a bit busy at the moment. I'll do my best to review this latest tomorrow.