Good unit test and minimal integration/e2e test coverage

[perotinus]

/sig multicluster

Close criteria:

• unit tests for each non-trivial package
• integration test for the cluster CRD

From https://github.com/kubernetes/community/blob/master/contributors/design-proposals/multicluster/cluster-registry/project-design-and-plan.md#alpha-targeting-late-q4-17

[perotinus]

I'm currently working on a testing plan that should cover this issue and set the direction for other testing in the cluster registry. This issue will probably be moved to the beta milestone.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle rotten
/remove-lifecycle stale

[fejta-bot]

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/close