Add unit test for Node

[Mockery-Li]

Fixes issue #48

The test cases cover valid and invalid arguments, but don't know how to test internal errors.

[k8s-ci-robot]

Hi @Mockery-Li. Thanks for your PR.

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[davidz627]

/ok-to-test

[davidz627]

Thanks for working on this! Just one small comment but looks good to me besides that

[davidz627]

can we use a valid volume ID here of the form projects/{project}/zones/{zone}/disks/{name}
technically I think we want to validate the ID format and return an invalidargument error if it is not in that format (although right now we don't do that)

[davidz627]

ditto for the other tests as well

[Mockery-Li]

OK. I created several const variables for default testing volume ID, staging path and target path.

[davidz627]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidz627, Mockery-Li

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