Add more unit tests under pkg/sidecar-controller

[xing-yang]

We need to add more unit tests under pkg/sidecar-controller.

[xing-yang]

/assign @nrb

[k8s-ci-robot]

@xing-yang: GitHub didn't allow me to assign the following users: nrb.

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In response to this:

/assign @nrb

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[xing-yang]

Hi Nolan, can you assign this to yourself? I don't know your github handle.

[nrb]

/assign @nrb

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[ggriffiths]

I meant to refer to this one @xing-yang in #266

[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.

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/lifecycle rotten

[nrb]

/remove-lifecycle rotten

[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.

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/lifecycle stale

[Kartik494]

Hi @xing-yang since i saw this PR is merged.So is there any work to be done on this issue?

[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.

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/lifecycle rotten

[fejta-bot]

Rotten issues close after 30d of inactivity.
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/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

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

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