test(contrib): add unit test for opensergo.go

[zoujiejun]

Description (what this PR does / why we need it):

coverage: 88.0% of statements

Which issue(s) this PR fixes (resolves / be part of):

part of #2135

[daemon365]

Please fix lint, use make fix

[zoujiejun]

Please fix lint, use make fix

fixed

[codecov-commenter]

Codecov Report

Merging #2137 (beb83ab) into main (25c5996) will not change coverage.
The diff coverage is n/a.

❗ Current head beb83ab differs from pull request most recent head 8496457. Consider uploading reports for the commit 8496457 to get more accurate results

@@           Coverage Diff           @@
##             main    #2137   +/-   ##
=======================================
  Coverage   79.08%   79.08%           
=======================================
  Files          84       84           
  Lines        3696     3696           
=======================================
  Hits         2923     2923           
  Misses        560      560           
  Partials      213      213           

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[daemon365]

LGTM

[shenqidebaozi]

LGTM