tests(tgb): increase coverage

[mr-linch]

related to #19

• handler.go
• middleware.go
• polling.go
• webhook.go

[codecov]

Codecov Report

Merging #17 (aa2b295) into main (316df7f) will increase coverage by 6.00%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   14.81%   20.81%   +6.00%     
==========================================
  Files          15       15              
  Lines        3504     3540      +36     
==========================================
+ Hits          519      737     +218     
+ Misses       2967     2777     -190     
- Partials       18       26       +8     

Impacted Files	Coverage Δ
tgb/webhook.go	89.20% <95.45%> (+89.20%)	⬆️
tgb/polling.go	85.41% <100.00%> (+85.41%)	⬆️
tgb/handler.go	100.00% <0.00%> (+100.00%)	⬆️
tgb/middleware.go	100.00% <0.00%> (+100.00%)	⬆️

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