More unit tests for default snapshot class

[xing-yang]

What happened:
Open this issue to track this comment from the code review:
#1210 (comment)
We need to add more unit tests.

What you expected to happen:

How to reproduce it:

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[gnufied]

Also can we add unit test for this scenario?

1. Create a volumegroupsnapshotclass.
2. Create one or more PVCs that use volumes.
3. Take snapshot of those PVCs via volumegroupsnapshot
4. Expect everything to work. Expect volumesnapshot objects to be ready.

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[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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/lifecycle rotten

[leonardoce]

/remove-lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale