test: add tests for mergeDeletionCallBack

[satyazzz123]

tests for mergeDeletionCallback

i) This test case covers a scenario when function is called with a non-existent source file and an existing destination directory

fixes a part of #881

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[seshapad]

@satyazzz123 License is missing from the file. Please add it and address the lint issues. Please check for lint issues by running make ci.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e88cece) 14.81% compared to head (9acf886) 14.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1118      +/-   ##
==========================================
+ Coverage   14.81%   14.86%   +0.04%     
==========================================
  Files          90       90              
  Lines        8321     8321              
==========================================
+ Hits         1233     1237       +4     
+ Misses       6770     6766       -4     
  Partials      318      318              

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[kmehant]

Thanks @satyazzz123 for the contribution, please feel free to add more test cases to this test function and also cover other functions in this file.
cc @seshapad

[satyazzz123]

Thanks @satyazzz123 for the contribution, please feel free to add more test cases to this test function and also cover other functions in this file. cc @seshapad

Yess I am working on the other tests soon will raise another PR.