add: metadata test

[daemon365]

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

Which issue(s) this PR fixes:

fixes #

Other special notes for reviewer:

[codecov-commenter]

Codecov Report

Merging #1324 (164ada8) into main (9bbf469) will increase coverage by 0.68%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1324      +/-   ##
==========================================
+ Coverage   54.15%   54.83%   +0.68%     
==========================================
  Files          56       57       +1     
  Lines        2661     2721      +60     
==========================================
+ Hits         1441     1492      +51     
- Misses       1078     1085       +7     
- Partials      142      144       +2     

Impacted Files	Coverage Δ
metadata/metadata.go	81.25% <0.00%> (ø)
config/config.go	56.94% <0.00%> (+0.60%)	⬆️
config/reader.go	79.16% <0.00%> (+2.69%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9bbf469...164ada8. Read the comment docs.