Add unit tests for sort.go

[atoato88]

This PR add unit tests for sort.go.

In making this PR, I found a item should be fixed about decision of Secret because it's /Secrets not /Secret.
I'll create another PR, soon.

[atoato88]

This is a part of #150 : More unit tests are needed.

[atoato88]

As of now, this PR doesn't pass test, because of item to be fixed.
#153 will fix that.

[atoato88]

/assign @justinsb

[atoato88]

/retest

[k8s-ci-robot]

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[fejta-bot]

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Mark the issue as fresh with /remove-lifecycle stale.
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[k8s-ci-robot]

@atoato88: PR needs rebase.

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[oomichi]

@atoato88 Is this still active? or will we need to drop?

[atoato88]

@oomichi This PR is pretty old and not active.
I'll close this PR.

[atoato88]

Said as above comment, I close PR.