improve unit testing cases coverage to 80%+

[hailaz]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.15 🎉

Comparison is base (34946f6) 79.96% compared to head (52dade5) 80.12%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2480      +/-   ##
==========================================
+ Coverage   79.96%   80.12%   +0.15%     
==========================================
  Files         598      599       +1     
  Lines       49570    49789     +219     
==========================================
+ Hits        39641    39891     +250     
+ Misses       7984     7956      -28     
+ Partials     1945     1942       -3     

Flag	Coverage Δ
go-1.15-386	80.17% <100.00%> (+0.13%)	⬆️
go-1.15-amd64	80.18% <100.00%> (?)
go-1.16-386	80.18% <100.00%> (+0.16%)	⬆️
go-1.16-amd64	80.16% <100.00%> (+0.17%)	⬆️
go-1.17-386	80.17% <100.00%> (?)
go-1.17-amd64	80.17% <100.00%> (?)
go-1.18-386	80.09% <100.00%> (+0.16%)	⬆️
go-1.18-amd64	80.08% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
text/gstr/gstr_parse.go	95.34% <100.00%> (+50.38%)	⬆️
contrib/drivers/oracle/oracle.go	79.45% <0.00%> (ø)
os/gfsnotify/gfsnotify_watcher_loop.go	87.39% <0.00%> (+9.24%)	⬆️

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