test: appendData prependData, when they are string

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

appendData prependData, when they are string

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #345 into master will increase coverage by 1.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
+ Coverage   95.08%   96.72%   +1.63%     
==========================================
  Files           7        7              
  Lines         122      122              
  Branches       27       27              
==========================================
+ Hits          116      118       +2     
+ Misses          6        4       -2     

Impacted Files	Coverage Δ
src/getLessOptions.js	100.00% <0.00%> (+6.66%)	⬆️

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