Feature/addtests

[Tatsinnit]

This PR intends to add more test with intention of catering low hanging fruits of capturing failure case tests and hence increasing the test coverage to almost 50% for this repo.

I have used direct calls and no mocks are involved so the correct logic can be test.

Thank yo use much in advance. ❤️🙏 Kind ping as fyi @weinong

[codecov-commenter]

Codecov Report

Merging #238 (a8c14d4) into master (92510eb) will increase coverage by 5.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
+ Coverage   44.34%   49.72%   +5.38%     
==========================================
  Files          15       15              
  Lines        1096     1096              
==========================================
+ Hits          486      545      +59     
+ Misses        577      520      -57     
+ Partials       33       31       -2     

see 3 files with indirect coverage changes

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[weinong]

Apologize for missing this PR. LGTM.