improve the coverage of yurtappset

[River-sh]

What type of PR is this?

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/kind enhancement

What this PR does / why we need it:

This PR enriches unit testing of the Yurtappset controller and improves test coverage.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind enhancement

What this PR does / why we need it:

This PR enriches unit testing of the Yurtappset controller and improves test coverage.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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[openyurt-bot]

Welcome @River-sh! It looks like this is your first PR to openyurtio/yurt-app-manager 🎉

[codecov]

Codecov Report

Merging #113 (1550680) into master (0e8bf4d) will increase coverage by 10.88%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #113       +/-   ##
===========================================
+ Coverage   26.42%   37.31%   +10.88%     
===========================================
  Files          42       42               
  Lines        4776     4776               
===========================================
+ Hits         1262     1782      +520     
+ Misses       3344     2754      -590     
- Partials      170      240       +70     

Flag	Coverage Δ
unittests	37.31% <ø> (+10.88%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...manager/controller/nodepool/nodepool_controller.go	56.75% <0.00%> (-1.02%)	⬇️
...ager/controller/yurtappset/adapter/adapter_util.go	65.62% <0.00%> (+40.62%)	⬆️
...ntroller/yurtappset/adapter/statefulset_adapter.go	41.87% <0.00%> (+41.87%)	⬆️
...ger/controller/yurtappset/yurtappset_controller.go	48.16% <0.00%> (+47.24%)	⬆️
...manager/controller/yurtappset/yurtappset_update.go	48.27% <0.00%> (+48.27%)	⬆️
...g/yurtappmanager/controller/yurtappset/revision.go	49.21% <0.00%> (+49.21%)	⬆️
...ntroller/yurtappset/yurtappset_controller_utils.go	60.00% <0.00%> (+60.00%)	⬆️
...rtappmanager/controller/yurtappset/pool_control.go	60.74% <0.00%> (+60.74%)	⬆️
...ontroller/yurtappset/adapter/deployment_adapter.go	66.66% <0.00%> (+66.66%)	⬆️

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[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, River-sh

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[rambohe-ch]

Fixes #74