test:add container_top test

[zhuangqh]

Signed-off-by: jerryzhuang [email protected]

Ⅰ. Describe what this PR did

add container_top test

Ⅱ. Does this pull request fix one issue?

fixes: #966

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[pouchrobot]

@zhuangqh Thanks for your contribution. 🍻
Please sign off in each of your commits.

[pouchrobot]

We found this is your first time to contribute to Pouch, @zhuangqh
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻

[codecov-io]

Codecov Report

Merging #1093 into master will decrease coverage by 0.61%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1093      +/-   ##
==========================================
- Coverage   16.47%   15.86%   -0.62%     
==========================================
  Files         161      161              
  Lines        8921     8824      -97     
==========================================
- Hits         1470     1400      -70     
+ Misses       7347     7321      -26     
+ Partials      104      103       -1

Impacted Files	Coverage Δ
client/container.go	0% <ø> (ø)	⬆️
client/container_top.go	100% <100%> (ø)
pkg/kernel/kernel.go	72.72% <0%> (-7.28%)	⬇️
pkg/utils/utils.go	75.6% <0%> (-6.46%)	⬇️
cli/command.go
client/client.go	35.48% <0%> (+6.91%)	⬆️

[ZouRui89]

Excellent work! LGTM

[allencloud]

Thanks for your review. @ZouRui89 LGTM

[allencloud]

@zhuangqh
Please do not add substring fixes: #966 in your pr, since this pr does not fix the whole issue. It also fix just one part of the issue.
If you add the substring in the pr description, It means that you are fixing the while issue with this pr. And GitHub will automatically close the issue , once this pull request is merged.