Add containers test

[bitoku]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR adds unit tests to crictl (a part of container.go).
This also adds stretchr/testify and go-test/deep library.

Which issue(s) this PR fixes:

#1152

Special notes for your reviewer:

I wrote tests with default unittest framework.
Which do you prefer to use test framework, ginkgo or default?
Exisiting unittests in cmd/crictl is written with the default one.

Does this PR introduce a user-facing change?

NONE

[saschagrunert]

Thank you for working on this, @bitoku! 🙏

[bitoku]

There seems no CI for crictl so I added them as well.
Thank you for reviewing!

[bitoku]

sorry for the late reaction.
I reflected your comment. could you please review it again?

[saschagrunert]

@SergeyKanzhelev PTAL again

[SergeyKanzhelev]

/lgtm

[bitoku]

I'm sorry for bothering you many times.
I tested it locally and it worked this time. not sure why it failed because it looks ok. need to check.

https://github.com/kubernetes-sigs/cri-tools/actions/runs/6874923452/job/18697587316?pr=1194

[saschagrunert]

I don't get why we're getting an exit code 1 for all successful tests 🤔 But ginkgo is indicating that the suite failed.

[SergeyKanzhelev]

Couple options to debug - increase the ginkgo log level and try removing the -p as a test. There is definitely something happens. Maybe a panic or something that is not being logged

[bitoku]

After some research I found the reason why it failed.

First of all, the reason it didn't happen in my local env was that I didn't rebase it onto upstream/main. After rebasing it, I was able to reproduce it.

And the CI failed because ginkgo somehow runs templates_test.go, which doesn't use ginkgo, and its test failed.
I don't know why ginkgo runs no-ginkgo spec file. I raised a issue about it (onsi/ginkgo#1303).

templates_test.go failed because of this change 092eddc#diff-911ebdfd44eef4e1d8f910ef1839b3e99c09a2fc4da1eb8b8f464e5bbfcafe9c .

strings.Title and cases.Title behave differently. To match cases.Title with strings.Title, it needs cases.NoLower as its option.
https://go.dev/play/p/jDL6uoPVB28

I tested in my local and my forked repo, and it worked so I believe it works this time...

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bitoku, saschagrunert, SergeyKanzhelev

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