test: add util test for atomiccount

[zhouhao3]

Signed-off-by: Zhou Hao [email protected]

Ⅰ. Describe what this PR did

Add util test for atomiccount,go.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

➜  atomiccount git:(add-util-test) go test -v atomiccount_test.go atomiccount.go
=== RUN   Test
OK: 2 passed
--- PASS: Test (0.00s)
PASS
ok      command-line-arguments  (cached)

Ⅴ. Special notes for reviews

[pouchrobot]

We found this is your first time to contribute to Dragonfly, @q384566678
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/dragonflyoss/Dragonfly/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 #1178 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1178      +/-   ##
==========================================
+ Coverage   47.47%   47.52%   +0.05%     
==========================================
  Files         113      114       +1     
  Lines        7193     7206      +13     
==========================================
+ Hits         3415     3425      +10     
- Misses       3505     3507       +2     
- Partials      273      274       +1

Impacted Files	Coverage Δ
supernode/daemon/mgr/scheduler/manager.go	21.91% <0%> (-0.69%)	⬇️
pkg/atomiccount/atomiccount.go	84.61% <0%> (ø)

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[lowzj]

LGTM