Added tests for uncovered code

[yevheniyJ]

No description provided.

[codecov]

Codecov Report

Merging #178 (431601f) into master (137829b) will increase coverage by 8.81%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
+ Coverage   81.26%   90.07%   +8.81%     
==========================================
  Files          29       29              
  Lines        1147     1147              
  Branches       97       97              
==========================================
+ Hits          932     1033     +101     
+ Misses        154       41     -113     
- Partials       61       73      +12     

Impacted Files	Coverage Δ
src/core/internal/retry/index.ts	84.00% <0.00%> (+8.00%)	⬆️
src/core/internal/axios/axiosProvider.ts	96.00% <0.00%> (+12.00%)	⬆️
src/core/index.ts	71.95% <0.00%> (+30.94%)	⬆️
src/index.ts	100.00% <0.00%> (+33.34%)	⬆️
src/core/internal/fetch/fetchClient.ts	66.67% <0.00%> (+58.34%)	⬆️

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