Add initial testcase

[zchee]

No description provided.

[codecov]

Codecov Report

Merging #4 (2ec68b9) into main (7bff2d4) will increase coverage by 25.5%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##            main      #4      +/-   ##
========================================
+ Coverage   22.5%   48.1%   +25.5%     
========================================
  Files         14      14              
  Lines        478     476       -2     
========================================
+ Hits         108     229     +121     
+ Misses       370     247     -123     

Impacted Files	Coverage Δ
pkg/detector/detector.go	76.1% <ø> (+76.1%)	⬆️
pkg/monitoredresource/monitoredresource.go	75.7% <0.0%> (+75.7%)	⬆️
pkg/detector/appengine.go	100.0% <0.0%> (+100.0%)	⬆️
pkg/detector/container.go	100.0% <0.0%> (+100.0%)	⬆️
pkg/detector/serverless.go	100.0% <0.0%> (+100.0%)	⬆️