Unit/Integration Tests (and Coverage)

[vlerenc]

This component lacks unit/integration tests (and coverage). Should we add them, so that integration in the Gardener becomes safer (in the context of the planned full output qualification and continuous deployment).

[hoeltcl]

Execute unit tests: tps://github.com/gardener/aws-lb-readvertiser/blob/master/.ci/check#L46
Execute static code checks: https://github.com/gardener/aws-lb-readvertiser/blob/master/.ci/check#L40
Execute lint checks: https://github.com/gardener/aws-lb-readvertiser/blob/master/.ci/check#L53

Test coverage pending.