Add unit test for /arana/pkg/config

[gongna-au]

What this PR does:

Which issue(s) this PR fixes:

Fixes #707

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
29.9% Duplication

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.51 🎉

Comparison is base (0457c45) 37.28% compared to head (cf8ebc0) 37.79%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #722      +/-   ##
==========================================
+ Coverage   37.28%   37.79%   +0.51%     
==========================================
  Files         230      230              
  Lines       24460    24460              
==========================================
+ Hits         9120     9245     +125     
+ Misses      14296    14192     -104     
+ Partials     1044     1023      -21     

see 7 files with indirect coverage changes

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