@wawlian: The label(s) kind/feature cannot be applied, because the repository doesn't have them
In response to [this](https://github.com/openyurtio/yurt-device-controller/issues/41):
>What would you like to be added:
>improve unit test coverage for yurt-device-controller:
>
>target coverage: 70%
>
>Why is this needed:
>improve unit test coverage for OpenYurt project.
>
>others
>/kind feature
Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.
What would you like to be added: improve unit test coverage for yurt-device-controller:
target coverage: 70%
Why is this needed: improve unit test coverage for OpenYurt project.
others /kind feature