test: add config validation tests
What does this MR do?
Add config validation tests and bring validate.go coverage to 100%
TODO
-
I added the Changelog
trailer (e.g.Changelog: feature
) to the commits that need to be included in the changelog -
I added unit tests or they are not required -
I added acceptance tests or they are not required -
I added documentation (or it's not required) -
I followed code review guidelines -
I followed Go Style guidelines